Physics – Condensed Matter – Superconductivity
Scientific paper
2010-12-26
Phys. Rev. B 83, 060512(2011)
Physics
Condensed Matter
Superconductivity
5 pages, 5 figs
Scientific paper
10.1103/PhysRevB.83.060512
We successfully grew the high-quality single crystal of Rb$_{0.78}$Fe$_2$Se$_{1.78}$, which shows sharp superconducting transition in magnetic susceptibility and electrical resistivity. Resistivity measurements show the onset superconducting transition ($T_{\rm c}$) at 32.1 K and zero resistivity at 30 K. From the low-temperature iso-magnetic-field magnetoresistance, large upper critical field $H_{\rm c2}$(0) has been estimated as high as 180 T for in-plane field and 59 T for out-of-plane field. The anisotropy $H^{ab}_{\rm c2}$(0)/$H^{c}_{\rm c2}$(0) is around 3.0, right lying between those observed in K$_x$Fe$_2$Se$_2$ and Cs$_x$Fe$_2$Se$_2$.
Chen Hua-Xing
Cheng Peiling
Li Zhao-Yu
Liu Hu Ran
Luo X. G.
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