Evidence of quantum criticality in the phase diagram of Kx Sr1-x Fe2 As2 from measurements of transport and thermoelectricity

Melissa Gooch, Bing Lv, Bernd Lorenz, Arnold M. Guloy, Ching Wu Chu

研究成果: Article同行評審

45 引文 斯高帕斯(Scopus)

摘要

The electrical transport and thermoelectric properties of Kx Sr1-x Fe2 As2 are investigated for 0≤x≤1. The resistivity ρ (T) shows a crossover from Fermi-liquid-like temperature dependence at small x to linear ∼T dependence at xc 0.4. With further increasing of x, (T) becomes nonlinear again. The thermoelectric power S (T) exhibits a similar crossover with increasing x with a logarithmic T dependence, S/T∼ln (T), near the critical doping xc. These results provide evidence for a quantum critical behavior due to the coupling of low-energy conduction electrons to two-dimensional spin fluctuations.

原文English
文章編號104504
期刊Physical Review B - Condensed Matter and Materials Physics
79
發行號10
DOIs
出版狀態Published - 2009 3月 3

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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