Evidence of quantum criticality in the phase diagram of KxSr1-xFe2As2 from measurements of transport and thermoelectricity

被引：46

作者：

Gooch, Melissa ^{[1
,5
]}

Lv, Bing ^{[2
,5
]}

Lorenz, Bernd ^{[1
,5
]}

Guloy, Arnold M. ^{[2
,5
]}

Chu, Ching-Wu ^{[1
,3
,4
,5
]}

机构：

[1] Univ Houston, Dept Phys, Houston, TX 77204 USA

[2] Univ Houston, Dept Chem, Houston, TX 77204 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[4] Hong Kong Univ Sci & Technol, Kowloon, Hong Kong, Peoples R China

[5] Univ Houston, TCSUH, Houston, TX 77204 USA

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 10期

关键词：

doping; electrical resistivity; Fermi liquid; phase diagrams; potassium compounds; spin fluctuations; strontium compounds; superconducting materials; thermoelectric power; LAYERED QUATERNARY COMPOUND; 43; K; SUPERCONDUCTIVITY;

D O I：

10.1103/PhysRevB.79.104504

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The electrical transport and thermoelectric properties of KxSr1-xFe2As2 are investigated for 0 <= x <= 1. The resistivity rho(T) shows a crossover from Fermi-liquid-like temperature dependence at small x to linear rho similar to T dependence at x(c)similar or equal to 0.4. With further increasing of x, rho(T) becomes nonlinear again. The thermoelectric power S(T) exhibits a similar crossover with increasing x with a logarithmic T dependence, S/T similar to ln(T), near the critical doping x(c). These results provide evidence for a quantum critical behavior due to the coupling of low-energy conduction electrons to two-dimensional spin fluctuations.

引用

页数：5

共 33 条

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