Sangita Bose, Bombay

Antonio Bianconi, Rome

Welcome !!!

A. Garcia-Garcia, Cambridge

Mesoscopic effects in conventional

superconductors

High Tc heterostructures

STO/LAO Heterostructures

Carbon Superconductors

<< BCS≥ No BCS

How to enhance SC substantially?

$10 Question

$106 Question

Mechanism of SC in cuprates?

Enhancement?

?

Why control?

Grains and thin films in conventional superconductors

Abeles, Cohen, Cullen, Phys. Rev. Lett., 17, 632 (1966) A.M. Goldman, Giaver.....

Thin films

Shape ResonancesBlatt, Thompson

Phys. Lett. 5, 6 (1963)

Shell EffectsParmenter, Phys. Rev. 166,

392 (1967)

Thin Films Single grains <

Ralph, Black,Tinkham,

Superconductivity in

Single Metal Particles PRL 74, 3241-3244

(1995).No isolated, size/shape unknown

Theory beyond BCS ~

FluctuationsRichardson Equations

J. von Delft et al., Phys. Rep., 345, 61 (2001)

Xue et al., Science 306, 1915 (2004) Shih et al., Science 324, 1314 (2009)

Thin Films

PRB 74 132504 (2006) Shanenko, Peeters, PRB 75 014519 (2007)

> atomic scale control of the thickness over a

macroscopic area

Schneider, et al., PRL 102, 207002 (2009)

Islands

PRL 108, 126802 (2012)

Ribeiro, AGG. PRL 108, 097004 (2012)

Theory:

?

S. Bose, AGG., Nature Materials 9, 550 (2010), PRB 84 104525 (2011)

GrainsSn

Pb

Theory:

PRB, 74, 052502 (2006)

PRL 100, 187001 (2008)

PRL 108, 097004 (2012)

?

Mason, Goldbart et al, Nature Physics 8 59 (2012)

Josephson junctions

SMS

Spin Filtered

Blamire et al, Nature Materials 10 849 (2011)

Kresin, Deutscher

+Experimental Control

+Predictive power

No Control

Theoreticians Drift

High Tc superconductors?

Bianconi, et al. Solid State Comm, 89, 933 (1994)

Stripes

Quantum size effects in high Tc

Bianconi, Perali, at al, Solid State Comm, 100, 181 (1996)

>

Blatt’s Shape resonances for

high Tc SC

Cuprates high Tc Heterostructures

Bozovic et al., Nature 455, 782 (2008)

SC 1 Single Layer Intrinsic inhomogeneities

Why?

Xue et al.: Arxiv: 12015694

Iron Pnictides Heterostructures

Enhancement of Tc by disorder

Bianconi, et al., Nature 466, 841 (2010)

Fractal distributions of dopants enhance

Tc in cuprates

Inhomogeneities Higher Tc

 PRL 108, 017002 (2012)

LaAlO3 /SrTiO3

Heterostructures

Triscone, Nature 456 624 (2008)

Control &Tunability

Spin-OrbitDisorder

Magnetism

PRB 85 020457 (2012)PRL 104, 126803 (2010)

Anderson, Mott Localization

Exotic Quantum Matter

Lesueur, arXiv:1112.2633

E Field effect

Carbon nanotubes FluctuationsHigh Tc?

How to suppress fluctuations?

<

Yang,PRB 74 155414 (2006)

Phys. Rev. Lett. 86, 2416 (2001)

Science 292, 2462 (2001)

Electric field effect

Dissipation Ropes

Single

Phase SlipsLehtinen, PRB 85 094508 (2012)

PRB 80, 214515 (2009)

CONTROL

PREDICTIVE POWER

Enhancement = $106

Theory

THANKS!

Conference dinner

Lunch < 1:45PM

Tomorrow, 7:30PMEverybody is invited!

Talks on time!