Resistivity in the Vicinity of a van Hove Singularity: Sr2RuO4 under Uniaxial Pressure

被引：87

作者：

Barber, M. E. ^{[1
,2
]}

Gibbs, A. S. ^{[1
,4
]}

Maeno, Y. ^{[3
]}

Mackenzie, A. P. ^{[1
,2
]}

Hicks, C. W. ^{[2
]}

机构：

[1] Univ St Andrews, Sch Phys & Astron, Scottish Univ Phys Alliance, St Andrews KY16 9SS, Fife, Scotland

[2] Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany

[3] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan

[4] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 OQX, Oxon, England

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 07期

基金：

日本学术振兴会; 英国工程与自然科学研究理事会;

关键词：

KADOWAKI-WOODS RATIO; T-C; SUPERCONDUCTIVITY; TRANSITION; EVOLUTION; STRESS; ORDER;

D O I：

10.1103/PhysRevLett.120.076602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the results of a combined study of the normal-state resistivity and superconducting transition temperature T-c of the unconventional superconductor Sr2RuO4 under uniaxial pressure. There is strong evidence that, as well as driving T-c through a maximum at similar to 3.5 K, compressive strains epsilon of nearly 1% along the crystallographic [100] axis drive the gamma Fermi surface sheet through a van Hove singularity, changing the temperature dependence of the resistivity from T-2 above, and below the transition region to T-1.5 within it. This occurs in extremely pure single-crystals in which the impurity contribution to the resistivity is < 100 n Omega cm, so our study also highlights the potential of uniaxial pressure as a more general probe of this class of physics in clean systems.

引用

页数：6

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