Journal
PHYSICAL REVIEW B
Volume 79, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.104504
Keywords
doping; electrical resistivity; Fermi liquid; phase diagrams; potassium compounds; spin fluctuations; strontium compounds; superconducting materials; thermoelectric power
Funding
- T.L.L. Temple Foundation
- J.J. and R. Moores Endowment
- State of Texas through TCSUH
- U.S. Air Force Office of Scientific Research, U.S. DOE
- NSF [CHE-0616805]
- R.A. Welch Foundation
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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.
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