1. Comment on 'Quantum Criticality and Nodal Superconductivity in the FeAs-Based Superconductor KFe$_2$As$_2$'
- Author
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Terashima, Taichi, Kimata, Motoi, Kurita, Nobuyuki, Satsukawa, Hidetaka, Harada, Atsushi, Hazama, Kaori, Imai, Motoharu, Sato, Akira, Kihou, Kunihiro, Lee, Chul-Ho, Kito, Hijiri, Eisaki, Hiroshi, Iyo, Akira, Saito, Taku, Fukazawa, Hideto, Kohori, Yoh, Harima, Hisatomo, and Uji, Shinya
- Subjects
Condensed Matter - Superconductivity ,Condensed Matter - Strongly Correlated Electrons - Abstract
In a recent Letter [J. K. Dong et al., Phys. Rev. Lett. 104, 087005 (2010)], Dong \textit{et al}. have observed a $T^{1.5}$ dependence of resistivity $\rho$ in KFe$_2$As$_2$ at the upper critical field $B_{c2}$ = 5 T parallel to the c axis and have suggested the existence of a field-induced quantum critical point (QCP) at $B_{c2}$. In this comment, we argue that observation of a $T^{1.5}$ dependence of $\rho$ in a sample showing broad resistive transitions does not constitute evidence for a QCP and that recent dHvA results do not support the proposed QCP., Comment: 3 pages, 2 figures + 1 supplemental figure, to be published in PRL
- Published
- 2010
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