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Page 1: Organic and Inorganic Low-Dimensional Crystalline …978-1-4899-2091...organic and inorganic chemistry, on the one hand, and solid state physics other, iii) To get a salient understanding

Organic and Inorganic Low-Dimensional Crystalline Materials

Page 2: Organic and Inorganic Low-Dimensional Crystalline …978-1-4899-2091...organic and inorganic chemistry, on the one hand, and solid state physics other, iii) To get a salient understanding

NATO ASI Series Advanced Science Institutes Series

A series presenting the results of activities sponsored by the NATO Science Committee, which aims at the dissemination of advanced scientific and technological knowledge, with a view to strengthening links between scientific communities.

The series is published by an international board of publishers in conjunction with the NATO Scientific Affairs Division

A Life Sciences B Physics

c Mathematical and Physical Sciences

D Behavioral and Social Sciences E Engineering and

Materials Sciences

F Computer and Systems Sciences G Ecological Sciences H Cell Biology

Recent Volumes in this Series

Plenum Publishing Corporation New York and London

D. Reidel Publishing Company Dordrecht, Boston, and Lancaster

Martinus Nljhoff Publishers The Hague, Boston, Dordrecht, and Lancaster

Springer-Verlag Berlin, Heidelberg, New York, London, Paris, and Tokyo

Volume 162-Quantum Uncertainties: Recent and Future Experiments and Interpretations edited by William M. Honig, David W. Kraft, and Emilio Panarella

Volume 163-Thin Film Growth Techniques for Low-Dimensional Structures edited by R. F. C. Farrow, S. S. P. Parkin, P. J. Dobson, J. H. Neave, and A. S. Arrott

Volume 164-Techniques and Concepts of High-Energy Physics IV edited by Thomas Ferbel

Volume 165-Relativistic Channeling edited by Richard A. Carrigan, Jr., and James A. Ellison

Volume 166-lncommensurate Crystals, Liquid Crystals, and Quasi-Crystals edited by J. F. Scott and N. A. Clark

Volume 167-Time-Dependent Effects in Disordered Materials edited by Roger Pynn and Tormod Riste

Volume 168-0rganic and Inorganic Low-Dimensional Crystalline Materials edited by Pierre Delhaes and Marc Drillon

Series B: Physics

Page 3: Organic and Inorganic Low-Dimensional Crystalline …978-1-4899-2091...organic and inorganic chemistry, on the one hand, and solid state physics other, iii) To get a salient understanding

Organic and Inorganic Low-Dimensional Crystalline Materials Edited by

Pierre Delhaes CNRS, Paul Pasctll Center Unlvet11ity of Bordeau)( I Tatence, France

and

Marc Drillon EHICS Strasbourg, France

Springer Science+Business Media, LLC

Page 4: Organic and Inorganic Low-Dimensional Crystalline …978-1-4899-2091...organic and inorganic chemistry, on the one hand, and solid state physics other, iii) To get a salient understanding

Proceedings of a NATO Advanced Research Workshop on Organic and Inorganic Low-Dimensional Crystalline Materials, held May 3-8, 1987, in Minorca, Baleares, Spain

Library of Congress Cataloging in Publication Data

NATO Advanced Research Workshop on Organic and Inorganic Low-Dimensional Crystalline Materials (1987: Minorca, Spain)

Organic and inorganic low-dimensional crystalline materials I edited by Pierre Delhaes and Marc Drillon.

p. cm.-(NATO ASI series. Series B, Physics; v. 168) "Proceedings of a NATO Advanced Research Workshop on Organic and Inorganic

Low-Dimensional Crystalline Materials, held May 3-8, 1987, in Minorca, Baleares, Spain"-T.p. verso.

"Published In cooperation with NATO Scientific Affairs Division." Bibliography: p. Includes Index. ISBN 978-1-4899-2093-5 ISBN 978-1-4899-2091-1 (eBook) DOI 10.1007/978-1-4899-2091-1

1. Solid state physics-Congresses. 2. Solid state chemistry-Congresses. 3. One­dimensional conductors-Congresses. 4. Superconductors-Congresses. 5. Magnetic materials-Congresses. I. Delhaes, Pierre. I!. Orillon, Marc. Ill. North Atlan­tic Treaty Organization. Scientific Affairs Division. IV. Title. V. Series. QC176.A1N28 1987 530.4'1-dc19 87-28561

© Springer Science+Business Media New York 1987 Originally published by Plenum Press, New York in 1987 Softcover reprint of the hardcover 1st edition 1987

All rights reserved

No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfUming, recording, or otherwise, without written permission from the Publisher

CIP

Page 5: Organic and Inorganic Low-Dimensional Crystalline …978-1-4899-2091...organic and inorganic chemistry, on the one hand, and solid state physics other, iii) To get a salient understanding

SPECIAL PROGRAM ON CONDENSED SYSTEMS OF LOW DIMENSIONALITY

This book contains the proceedings of a NATO Advanced Reserach Workshop held within the program of activities of the NATO Special Program on Con­densed Systems of Low Dimensionality, running from 1983 to 1988 as part of the activities of the NATO Science Committee.

Other books previously published as a result of the activities of the Special Program are:

Volume 148 INTERCALATION IN LAYERED MATERIALS edited by M. S. Dresselhaus

Volume 152 OPTICAL PROPERTIES OF NARROW-GAP LOW-DIMENSIONAL STRUCTURES edited by C. M. Sotomayor Torres, J. C. Portal, J. C. Maan, and R. A. Stradling

Volume 163 THIN FILM GROWTH TECHNIQUES FOR LOW-DIMENSIONAL STRUCTURES edited by R. F. C. Farrow, S. S. P. Parkin, P. J. Dobson, J. H. Neave, and A. S. Arrott

Page 6: Organic and Inorganic Low-Dimensional Crystalline …978-1-4899-2091...organic and inorganic chemistry, on the one hand, and solid state physics other, iii) To get a salient understanding

PREFACE

The research of unitary concepts in solid state and molecular chemistry is of current interest

for both chemist and physicist communities. It is clear that due to their relative simplicity, low­

dimensional materials have attracted most of the attention. Thus, many non-trivial problems were

solved in chain systems, giving some insight into the behavior of real systems which would

otherwise be untractable.

The NATO Advanced Research Workshop on "Organic and Inorganic Low-Dimensional

Crystalline Materials" was organized to review the most striking electronic properties exhibited by

organic and inorganic sytems whose space dimensionality ranges from zero (Od) to one (1d), and to

discuss related scientific and technological potentials. The initial objectives of this Workshop were,

respectively:

i) To research unitary concepts in solid state physics, in particular for one dimensional compounds,

ii) To reinforce, through a close coupling between theory and experiment, the interplay between

organic and inorganic chemistry, on the one hand, and solid state physics on the other,

iii) To get a salient understanding of new low-dimensional materials showing "exotic" physical

properties, in conjunction with structural features.

To reach these goals, the meeting was organized in three different steps as reported in the

table of contents. The first sessions were devoted to plenary lectures on the different classes of low­

dimensional materials presenting either a mixed-valence or a magnetic character. Topics relative to

organic as well as inorganic materials were rewieved; this is rather unusual in standard conferences,

since researches on conducting and magnetic compounds are traditionally segregated. These

presentations were followed by a series of review papers on the physical properties, mainly on

magnetic aspects (phase transitions, linear and nonlinear excitations, Haldane conjecture, .. etc). One

special session was organized on the new superconducting materials, the organic ones as well as

the new ternary oxides which present superconductivity above the boiling point of liquid nitrogen. In

addition to the first series of review papers, several lectures were given on special topics in

connection with the main subject. These lectures were devoted to the problem of charge transfer in

biological systems, studies on large metallic clusters, which are regarded as "zero-dimensional

systems", and potential applications of mixed valence compounds, including equally organized

monomolecular layer systems (Langmuir-Blodgett films). The purpose of these special sessions was

both to increase the convergence between researches whose goals are different, and to get further

information before the round table discussions.

vii

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For a complementary level of information, each participant presented one poster relevant to

these topics; the new results on magnetic chains as well as on conducting materials are included as

short contributions in this book.

The last part was devoted to the round tables on prospects and developments. The

proposed subjects (new conducting systems, new magnetic compounds, ferromagnets, competition

between magnetism - superconductivity and charge density waves, potential technology directions)

were presented by the group leaders, then discussed in small groups of abo!Jl ten persons.

Schemes for designing new types of materials were reported. Summaries of these discussions are

given in the last part of this volume.

The concluding remart<s .were given by Prof. V.J. Emery, who emphasized the interest in

using large equipments, such as different neutron reactors or synchrotron sources, for analyzing

crystal structures (long-range order but also local organization, structural phase transitions, .. etc). An

outstanding example of new unexpected and very stimulating findings is the discovery of the new

"high T c" superconductors.

We wish to mention that this NATO wort<shop was prepared and organized thanks to the

positive contribution of the organizing committee (D. Beltran (Spain), R. Cariin (USA), LJ. de Jongh

(Netheriands), and J. Rouxel (France)), and the enthusiasm during the preparation of study-group

reports of the leaders (A. Barraud (France), D. Brom (Netheriands), R. Cariin (USA), H.J. Keller

(Germany) and F. Palacio (Spain)).

Finally, we wish to thank the panel on "Condensed Systems of Low Dimensionality" of

NATO's Scientific Affairs Division for the financial and administrative support which made this

workshop possible.

P. Delhaes and M. Drillon

viii

Page 8: Organic and Inorganic Low-Dimensional Crystalline …978-1-4899-2091...organic and inorganic chemistry, on the one hand, and solid state physics other, iii) To get a salient understanding

CONTENTS

PLENARY LECTURES

SOLID STATE CRYSTAL CHEMISTRY OF lD INORGANIC CHAINS J. Rouxel

STRUCTURES AND PROPERTIES OF LOW-DIMENSIONAL METAL COMPLEXES A.E. Underhill

1

17

LIGAND BRIDGED MIXED-VALENCY METAL CHAIN COMPLEXES: PROTOTYPE N-SITE, N-ELECTRON SYSTEMS WITH ELECTRON-PHONON COUPLING • • • • • • • • • • • 33

P. Day

ELECTRONIC STRUCTURE OF LINEAR CHARGE TRANSFER SOLIDS Z.G. Soos

47

INSULATING MAGNETIC CHAINS: IONOCOVALENT COMPOUNDS • • • • • • • . • 63 M. Steiner

INSULATING MAGNETIC CHAINS: RECENT MODELS AND MATERIALS C.P. Landee

'15

MAGNETIC ORDERING OF MnJI cull BIMETALLIC SYSTEMS,~ DESIGN OF MOLECULAR FERROMAGNETS • . • • • • • • • • • • • • • • • • • • • • • • • • • • • 93

o. Kahn

EXOTIC MAGNETIC SYSTEMS • . • • • • . • • • • • • • • c. Benelli, A. Caneschi, D. Gatteschi, P. Rey.

109

MAGNETIC PHASE TRANSITIONS IN LOW DIMENSIONAL SYSTEMS • • • • • • • • 125 J.P. Renard

CHAIN-,LIKE MAGNETIC SYSTEMS: NON LINEAR EXCITATIONS AND QUANTUM EFFECTS • • • • • • • . • • • • • • • • • • • • • • . . • 141

K. Kopinga, W.J.M. de Jonge

FERROMAGNETIC EXCHANGE IN MOLECULAR SOLIDS J.S. Miller, A.J. Epstein

THEORY OF THE ONE AND TWO DIMENSIONAL ELECTRON GAS v. J. Emery

ANION PERIODICITY AND ORDERING EFFECTS IN ONE DIMENSIONAL ORGANIC

159

•. 175

CONDUCTORS • • • • • • • • • • • • • • • • • • • • • • • • . . • • • . 185 J.P. Pouget

ix

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MAGNETIC PROPERTIES OF BECHGAARD SALTS AND RELATED COMPOUNDS, ROLE OF THE ELECTRONIC LOCALIZATION • • • • • • • • • • • • . • • • • 201

c. Coulon

MOLECULAR METALS AND SUPERCONDUCTORS: BEDT-TTF RADICAL SALTS • • • • • 219 D. Schweitzer, H.J. Keller

POLYNUCLEAR KETAL CLUSTER COMPOUNDS: A NEW CHEMICAL SUBMICRON STRUCTURE • • • • • • • • • . • • • • • • • 231

L.J. de Jongh

KETAL CLUSTERS ACTIVE SITES IN PROTEINES • • • • • • • • • • • • • • • 243

E.I. Solomon, J.E. Pates, T.D. Westmoreland Lung-Shan Kan, M.D. Allendorf, D.J. Spira-Solomon

LANGMUIR-BLODGETT FILMS OF DONOR-SIGMA-ACCEPTOR MOLECULES AND PROSPECTS FOR ORGANIC RECTIFIERS • • • • • • • • • • . • • • • . • . • . 271

R.K. Metzger, C.A. Panetta

MIXED VALENCE COMPOUNDS: POTENTIAL APPLICATIONS IN MATERIALS AND MOLECULAR ELECTRONICS • • • • • . • • • • • . • . . • • • . . . • 287

J.P. Launay

COMMUNICATIONS ON MOLECULAR CONDUCTORS

DIMETHYL-DICYANOBENZOCHINODIIKINE WITH Li+, Ag+ AND cu+ AS COUNTERIONS: NEW RADICAL-ANION SALTS WITH EXTREMELY HIGH CONDUCTIVITY . • . • 297

J.V. von Schultz, M. Bair, H.P. Werner, A. Aumuller, P. Erk, s. Hunig

CONDUCTIVE SOLIDS BASED ON SOME NEW MOLECULES WITH ISOTHIAZOLO-RINGS • • • • • • • • • . • • • 301

G. Papavassiliou, G.A. Kousdis, V. Gionis, J.S. Zambounis, · S.Y. Yiannopoulos

PYRIDINO-TETRAHETEROFULVALENES AND A FEW OF THEIR SALTS • • . . . . • 305 G. Papavassiliou, S.Y. Yiannopoulos, J.S. Zambounis

SYSTEMATIC VARIATIONS OF THE BEDT-TTF RING SYSTEMS: SYNTHESIS AND PHYSICAL PROPERTIES OF NEW RADICAL! CATION SALTS

R.R. Schumaker, E. Dupart, R. Laversanne, C. Coulon, P. Delhaes

TRANSFER INTEGRALS IN (DIMET) 2 MF6 : COMPARISON OF EHT AND CNDO

• 309

CALCULATIONS • • • • • • • • . . • • • • • • . . . • . 313 L. Ducasse, H. Abderrabba, A. Fritsch, B. Gallois

CRYSTAL STRUCTURE AND PHYSICAL PROPERTIES OF A NEW CONDUCTING CHARGE TRANSFER SALT: (BEDT-TTF) 3 Cl2 • 2H2 0 . • . • • • • 317

D. Chasseau, D. Watkin, K. Rosseinsky, K. Kurmoo, P. Day

ELECTRONIC EXCITATIONS IN (BEDT-TTF) SALTS H.W. Helberg

• • • • • 321

EXISTENCE OF TWO PHASES IN ~-(BEDT-TTF) 2 I3 : PROOF BY RESONANCE RAMAN SPECTROSCOPY . • • • • • • • • • • • • • • • • • . . • • • • • . . • • 325

R. Swietlik, D. Schweitzer, H.J. Keller

X

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RESONANCE RAMAN SPECTRA OF I; IN TEDA(TRIETHYLENEDIAMINE) I TCNQ 2' ~

AND ~-(BEDT"'-TTF) 2 I3 ••••••••••••• • 329 A.D. Bandrauk, K.D. Truong, c. Carlone

IMPORTANCE OF INTERMOLECULAR HYDROGEN-) HYDROGEN AND HYDROGEN- ANION CONTACTS FOR THE LATTICE SOFTNESS AND THE SUPERCONDUCTIVITY OF ~-(ET) 2 X <x- = I; , Aui; , IBr; l . . . . . . . . . . . . . . . . . . . . . 333

M.H. Whangbo, J.M. Williams, A.J. Schultz, A. Beno

SYNTHESIS AND CHARACTERIZATION OF TTF SALTS OF PLANAR PLATINIUM, PALLADIUM', NICKEL AND COPPER (1,2, DITHIO-OXALATO S,1S') ANIONS AND THE CRYSTAL AND MOLECULAR STRUCTURE OF BIS(TETRATHIAFULVALENENIUM) BIS(1,2, DITHIOOXALATO S,S') PALLADATE (ll) • • • • • • • • • • • • • • • • • 337

C. Bellito, M. Bonamico, V. Fares, P. Imperatori, s. Patrizio

FINE STRUCTURE TO THE v AND 2v BANDS (v = v(Cl.PtTil -Cl) THE SYMMET~IC 1 1 1

CHAIN STRECHING MODE) OF [Pt (en) 2 ] [Pt (en) 2 Cl 2 ] [Cl04 ] 4 • • • • • • • 341 R.J.H. Clark, V.B. Croud

CORRELATION OF SPECTROSCOPIC AND MAGNETIC DATA OF TWO CHARGE TRANSFER COMPOUNDS OF TCNQ WITH CATIONIC COPPER CHELATES . • • . • • • • • • • 345

M. Schwartz, W.E Hatfield

COUNTER-ION INFLUENCES ON THE ELECTRICAL CONDUCTION PROPERTIES OF 1,2,-DITHIOLENE COORDINATION COMPOUNDS • • • • • • • • • • • 349

L.R. Groenevel, G.J. Kramer, T.B.L.W. von Marinelli, H.B. Brom, J.G. Haasnoot, J. Reedijk

SINGLE CRYSTAL ESR STUDIES OF N-TETRABUTYLAMMONIUM' NICKEL' (0-BENZENE-DISELENOLATE); AND RELATED TRANSITION METAL COMPLEXES 353

M.T. Jones, J.H. Roble, M. Sing, T. Marvo

ESR OF SOME M[Pt(mnt) 2 ] AND M[Pd(mnt) 2 ] POLYCRYSTALLINE COMPLEXES •• 357 M.T. Jones, J.M. Patane, P.I. Clemenson, A.E. Underhill

A NEW FAMILY OF ONE-DIMENSIONAL CONDUCTORS DERIVED FROM MAGNUS GREEN-TYPE SALTS [Pt(NH3 ) 4 ] [PtX4 ] (X= Cl,Br): CLASS TI AND I MIXED-VALENCE CHAINS IN A DOUBLE CHAIN STRUCTURE • • • • • • . • • • • . • • . • • • . • • . . 361

J.P. Catinat, T. Robert, G. Offergeld

CONDUCTIVE MATERIALS BASED ON RHODIUM AND IRIDIUM COMPLEXES OF CARBOXYAZOLES • • . • • • • • • . • • • • • • • • • • • • • 365

J.C. Bayon, G. Net

ONE DIMENSIONAL ELECTRONIC SYSTEMS: METALLIC AND SYNTHETIC WIRES • • • 369 H.B. Brom, G.J. Kramer

SUPERCONDUCTIVITY IN RAPIDLY COOLED Gd3 Ba3 Cu4 02 • • • • • • • • • • 373 D.A. Robinson, A. Morrobel-Sosa, c. Alexander, J.S. Thrasher, c. Asavaroengchai, R.M. Metzger

COMMUNICATIONS ON MAGNETIC CHAINS

DIMENSIONAL CROSSOVER IN THE MOLECULAR FERROMAGNETS DECAMETHYLFERROCENIUM TETRACYANOETHENIDE • • • • • • • • • • • . 377

S. Chittipeddi, A.J. Epstein, J.S. Miller

xi

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SYNTHETIC PATHWAYS TO LOW DIMENSIONAL COMPOUNDS CONTAINING TRANSITION KETAL IONS .AND NITROXIDE RADICALS . • • • • • • • • • • •

A. Canneschi, D. Gatteschi, J. Laugier, P. Rey, R. Sessoli, c. Zanchini

381

MAGNETIC PROPERTIES OF COUPLED LANTHANIDE-RADICAL SPECIES •••• 385 c. Benelli, A. Caneschi, D. Gatteschi, J. Laugier, P. Rey

MAGNETIC BEHAVIOR OF lD HELICOIDAL CHAINS IN BA7 CuFe6 F34

A NEW KIND OF FERRIMAGNETIC ld SYSTEM • • ••• 389 J. Renaudin, G. Ferey, K. Zemirli, F. Varret, A. de Kozak, K. Drillon

MAGNETIC ANISOTROPY STUDIES OF ld BIMETALLIC FERRIKAGNETIC COMPOUNDS . . . • • • . . • • . . •... 393

Yu Pei, K. Verdaguier, 0. Kahn, J.P. Renard, J. Sletten

CRYSTAL CHEMISTRY AND MAGNETIC PROPERTIES OF NEW FLUORIDES WITH USOVITE-TYPE STRUCTURES • 397

J. Darriet, Xu Qiang, A. Tressaud, R. Georges, J.L. Soubeyroux

DESIGN OF LOW DIMENSIONAL FERRIMAGNETIC COMPOUNDS: NEW MAGNETIC LATTICES IN THE "EDTA-FAKILY" •••• 401

E. Coronado, A. Barba, D. Beltran, R. Burriel, R. Carlin

LOW TEMPERATURE INVESTIGATION OF THE THERMAL AND MAGNETIC PROPERTIES OF ld FERRIMAGNETIC SYSTEMS • • • • • • • • • • • • • • • • • • • 405

E. Coronado, P.R. Nugteren, K. Drillon, D. Beltran, L.J. de Jongh, R. Georges

FERRIKAGNETISM IN HOKOKETALLIC LINEAR CHAINS: CuX2 .4/3TKSO, X = Cl, Br • • • • • • • • • • • • • • • • • • . • • • • • • 409

C.P. Landee, A. Djili, K. Newhall, D.E. Mudgett, R.D. Willett, H. Place, B. Scott

MAGNETISM OF QUANTUM-CLASSICAL FERRIMAGNETIC CHAINS SHOWING ALTERNATE HEISENBERG COUPLING: APPLICATION TO MnCu (obp) (H2 0) 3 , H2 0 413

J. Curely, R. Georges, J.C. Gianduzzo, Q. Xu, 0. Kahn, Y. Pei, J. Sletten

DIMERS, REGULAR AND DOUBLE CHAINS IN VANADYL (IV) PHOSPHATES •••.• 417 G. Villleneuve, P. Amoros, D. Beltran, M. Drillon

NEW ld-SYSTEMS MADE OF INTERACTING COPPER(II) TRIMERS; EXPERIMENTAL AND THEORETICAL INVESTIGATION • • • • • •

M. Drillon, M. Belaiche, J.M. Heintz, G. Villeneuve, A. Boukhari, J. Aride

421

MAGNETIC BEHAVIOR OF HYDRATED TETRAFLUOROMANGANATES(III) ••••••• 425 F. Palacio, M. Andres

STRUCTURE AND MAGNETISM IN LINEAR CHAIN FLUOROMANGANATES(III) W. Massa, J. Pebler, F. Hahn, D. Babel

MAGNETO-STRUCTURAL CORRELATIONS IN ~-HALO BRIDGED

429

COPPER(II) CHAINS • • • • • • • • • • • • • • ••••••• 433 D. Beltran, J.V. Folgado, R. Iba~ez, E. Coronado, J.L. Mesa, T. Rojo, G. Villeneuve

xii

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CLUSTER CALCULATIONS ON THE CHAIN COMPOUND AQUA[N-(SALICYLADIMINATO)GLYCINATO]COPPER(II) HEMIHYDRATE • • • • • • 437

i.E. Hatfield, J.H. Helms, B.R. Rohrs

NON-LINEAR EXCITATIONS IN THE ANTIFERROMAGNETIC CHAIN OF Rb2 Mn1 _xFexF8 *H2 0 (X,0.50) • • • • • • • • • • • • • • • . . • • 441

J. Pebler, D. Babel

ONE DIMENSIONAL EXCITATION ENERGY TRANSFER IN TMMC AND RELATED COMPOUNDS • • • • • • • • • • • • • • • • . • • • • • • . 445

R. Knochenmuss, H.U. Gudel

QUANTUM ENERGY GAP IN THE S=l HEISENBERG ANTIFERROMAGNET NENP: EXPERIMENTAL DATA AND HALDANE CONJECTURE • • • • • • • • • • •

J.P. Renard, K. Verdaguer, L.P. Regnault, W.A.C. Erkelens, J. Rossat-Mignod, W.G. Stirling

• • • 448

NEUTRON DIFFRACTION STUDY OF KnRhAs NEAR TN: THE CRITICAL REGIME 453 J. Bartolome, B. Chenevier, K. Bacman, D. Fruchart, c. Rillo, R. Navarro, J.P. Regnault, P. Erkelens, J. Rossat-Mignod, R. Fruchar

REPORTS ON ROUND TABLES

NEW HIGHLY CONDUCTING SYSTEMS • • • • • • . . • • • • • • • • • • • 457 K.J. Keller, A.D. Bandrauk, J.C. Bayon, C. Bellito, R.J.M. Clark P. Day, J.G, Haasnoot, i.E. Hatfied, M.T. Jones, G. Papavassiliou T. Robert, J.U. von Schultz, A.E. Underhill, K.M. Whangbo

FERROMAGNETIC COMPOUNDS • • 463 R.L. Carlin, D. Beltran, R. Burriel, C. Benelli, A. Caneschi, o. Kahn, C.P. Landee, J. Pebler

ROUND TABLE ON NEW LOW-DIMENSIONAL MAGNETIC MATERIALS • • . • • • • • 465 F. Palacio, E. Coronado, J. Darriet, K. Drillon, G. Ferey, D. Gatteschi, W. Kassa, P. Rey, T. Rojo, z. Soos, J. Torrance, M. Verdaguer, G. Villeneuve

ROUND TABLE 4. COMPETITION BITVEIK (SUPER)CONDUCTIVITY, CDW/SDW, (SPIN)PEIERLS.TRANSITIOIS AND MAGNETISM ••••••••••••••• 471

H.B. Brom, D. Chasseau, C. Coulon, L. Ducasse, V.J. Emery, H.W. Helberg, J.P. Pouget, D.J.K. Schweitzer, M. Steiner, M. Weger

ROUND TABLE ON POTENTIAL TECHNOLOGICAL APPLICATIONS A. Barraud, P. Delhaes, L.J. De Jongb, H. Gudel, 0. Kahn, J.P. Launay, R. Metzger, J.S. Killer, J.P. Renard

PARTICIPANTS • • • • • • • • • • • • • • • • • • • •

INDEX • • • • • • • • • • • • • • • • • • • • • • •

475

479

481

xiii


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