Physics – Condensed Matter – Superconductivity
Scientific paper
2010-03-05
J. Phys. Soc. Jpn., Vol.79, No.7, 074706 (2010)
Physics
Condensed Matter
Superconductivity
10 pages, 4 figures
Scientific paper
10.1143/JPSJ.79.074706
We have investigated the temperature dependence of the resistive upper critical fields ($\mu_{0}H_{\rm c2}(T)$) for an Fe$_{1.05}$Te$_{0.85}$Se$_{0.15}$ single crystal, which exhibit superconductivity at $T_{\rm c} \sim 14 K, in magnetic fields of up to 55 T. Two-dimensional feature and superconducting fluctuations of the samples are found to be weak, because the resistive broadening effect on applied magnetic fields of up to 14 T is small. The Pauli paramagnetic effect is obviously evidenced by the strong suppression of the $\mu_{0}H_{\rm c2}^{ab}(T)$ ($H \parallel ab$) curve and nearly isotropic $\mu_{0}H_{\rm c2}(0) \approx 47 T is seen for both $H \parallel ab$ and $H \parallel c$. This fact is almost identical to the results of Fe$_{1+y}$Te$_{0.6}$Se$_{0.4}$ single crystals reported previously. We have discussed that the small anisotropy of the upper critical field at low temperatures in Fe$_{1+y}$(Te,Se) systems against the variation of the Te/Se ratio.
Hagiwara Manabu
Kida Takanori
Kotani Masao
Mizuguchi Yoshikazu
Takano Yasushi
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