TY - JOUR
T1 - Evidence of quantum criticality in the phase diagram of Kx Sr1-x Fe2 As2 from measurements of transport and thermoelectricity
AU - Gooch, Melissa
AU - Lv, Bing
AU - Lorenz, Bernd
AU - Guloy, Arnold M.
AU - Chu, Ching Wu
PY - 2009/3/3
Y1 - 2009/3/3
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.79.104504
DO - 10.1103/PhysRevB.79.104504
M3 - Article
AN - SCOPUS:63249090764
SN - 1098-0121
VL - 79
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 10
M1 - 104504
ER -