Physics – Condensed Matter – Superconductivity
Scientific paper
2009-09-26
Physics
Condensed Matter
Superconductivity
This paper is replaced by arXiv:0910.2806, which includes a detailed study of the quantum criticality in KFe2As2. The paper ar
Scientific paper
The in-plane resistivity $\rho$ and thermal conductivity $\kappa$ of extremely overdoped KFe$_2$As$_2$ ($T_c$ = 3.0 K) single crystal were studied. It is found that $\rho \sim T^{1.5}$ at low temperature, a typical non-Fermi liquid behavior of electrons scattered by antiferromagnetic spin fluctuations. In zero field, we observed a large residual linear term $\kappa_0/T$, about one third of the normal-state value. In low magnetic fields, $\kappa_0/T(H)$ increases very fast. Such a behavior of $\kappa_0/T$ mimics the d-wave cuprate superconductors, therefore provides clear evidence for nodes in the superconducting gap of KFe$_2$As$_2$. Based on the Fermi surface topology of KFe$_2$As$_2$, it is believed that the dominant intraband pairing via antiferromagnetic spin fluctuations results in the unconventional superconducting gap with nodes.
Chen Hua-Xing
Dai Yi-Fang
Dong J. K.
Guan T. Y.
He Yuncun
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