µSR Investigation of Doped IrTe2

Murray WilsonJiaqiang Yan, David Mandrus, Timothy Munsie, Teresa Medina, Graeme Luke

Outline

• Motivation

• µSR Introduction

• Ir0.95Pt0.05Te2 TF µSR

• Fe0.33Ir0.83Te2 ZF µSR

• Conclusion

IrTe

1/15

Motivation – IrTe2

P3m 1

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

B = 300 G

TF µSR

6/15

Pt-IrTe2

𝑛𝑠=𝑚𝜎𝑆𝐶

0.043𝜇0𝑒2𝛾𝜇𝛷0√2

𝜎 𝑆𝐶=√𝜎 2−𝜎𝑁2

Superfluid Density

7/15

Pt-IrTe2

𝑛𝑠=𝑚

𝜇0 𝜆02𝑒2¿

∆ (𝑇 )=∆0 tanh (1.837(𝑇 𝐶

𝑇 −1)0.51

)

Superfluid Density

8/15

Pt-IrTe2

Superfluid Density

9/15

Pt-IrTe2

Ir0.95Pt0.05Te2Present Work

Ir0.95Pd0.05Te2Ref. [1] (STS)

BCS weak coupling

meV meV

[1] D.J. Yu et. al PRB 89, 100501(R) March 4 2014

BCS Comparison

10/15

Fe0.33Ir0.83Te2Single Crystal

ZF µSR

11/15

Fe-IrTe2

ZF µSR

12/15

Fe-IrTe2

ZF µSR

13/15

Spin Glass TC ≈ 10K

Fe-IrTe2

ZF µSR

14/15

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 MunsieAlannah HallasTeresa MedinaDr. Graeme Luke

Lian LiuBenjamin FrandsenDr. Yasutomo Uemura

Dr. Bassam HittiDr. Gerald Morris

Dr. Jiaqiang YanDr. David Mandrus