µSR Investigation of Doped IrTe2
Murray Wilson
Jiaqiang Yan, David Mandrus, Timothy Munsie, Teresa Medina, Graeme Luke
Outline
• Motivation
• µSR Introduction
• Ir0.95Pt0.05Te2 TF µSR
• Fe0.33Ir0.83Te2 ZF µSR
• Conclusion
Ir Te
1/15
Motivation – IrTe2
P3 m1
Layered structure
High spin-orbit coupling
Structural transition
Matsumoto JLTP 1999
2/15
Motivation
Yang PRL 108 116402 (2012)
Yan arXiv:1309.4829v1
Feng Sci. Rep. 3 1153 2013
µSR Technique
3/15 J.E. Sonier Muon Spin Rotation/Relaxation/Resonance (µSR)
µSR Technique
4/15
µSR Technique
5/15
Ir0.95Pt0.05Te2
𝐴(𝑡) = 𝐴𝑖cos(𝜔𝑖𝑡 + 𝜑𝑖)𝑒−12(𝜎𝑖𝑡)
22
𝑖=1
B = 300 G
TF µSR
6/15
Pt-IrTe2
𝑛𝑠 =𝑚𝜎𝑆𝐶
0.043𝜇0𝑒2𝛾𝜇𝛷0 2
𝜎𝑆𝐶 = 𝜎2 − 𝜎𝑁
2
Superfluid Density
7/15
Pt-IrTe2
𝑛𝑠 =𝑚
𝜇0𝜆02𝑒21 + 2 𝑑𝐸
𝑒𝐸/(𝑘𝐵𝑇)
(𝑒𝐸/(𝑘𝐵𝑇)+1)2
∞
Δ(𝑇)
𝐸
𝐸2 − ∆(𝑇)
∆ 𝑇 = ∆0tanh 1.837𝑇𝐶𝑇− 1
0.51
Superfluid Density
8/15
Pt-IrTe2
Superfluid Density
9/15
Pt-IrTe2
Ir0.95Pt0.05Te2
Present Work Ir0.95Pd0.05Te2 Ref. [1] (STS)
BCS weak coupling
∆0= 0.33 meV
𝑇𝐶 = 2.2K
2∆0𝑘𝐵𝑇𝐶= 3.5
∆0= 0.39 meV
𝑇𝐶 = 2.5K
2∆0𝑘𝐵𝑇𝐶= 3.6
2∆0𝑘𝐵𝑇𝐶= 3.5
[1] D.J. Yu et. al PRB 89, 100501(R) March 4 2014
BCS Comparison
10/15
Fe0.33Ir0.83Te2 Single Crystal
ZF µSR
11/15
Fe-IrTe2
ZF µSR
12/15
Fe-IrTe2
𝐴 = 𝐴1𝐾𝑇(𝜎, 𝑡) + 𝐴2𝑒−𝜆1𝑡 + 𝐴3𝑒
−𝜆2𝑡
𝐾𝑇 𝜎, 𝑇 =1
3+2
31 − (𝜎𝑡)2 𝑒−(𝜎𝑡)
2/2
ZF µSR
13/15
Spin Glass TC ≈ 10K
Fe-IrTe2
ZF µSR
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Fe-IrTe2
J.-Q. Yan et al. arXiv:1309.4829v1 [cond-mat.supr-con] 19-09-2013
Fe-IrTe2 spin glass, TC ≈ 10K
Pt-IrTe2 weak coupling fully gapped BCS superconductor, TC = 2.24K
15/15
Conclusions
Acknowledgments
Timothy Munsie Alannah Hallas Teresa Medina Dr. Graeme Luke
Lian Liu Benjamin Frandsen Dr. Yasutomo Uemura
Dr. Bassam Hitti Dr. Gerald Morris
Dr. Jiaqiang Yan Dr. David Mandrus