| Sizable Residual Quasiparticle Density of States Induced by Impurity Scattering Effect in Ba（Fe1-xCox）2As2 Single Crystals |
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| 引用本文： | 牟刚,曾斌,程鹏,王钊胜,方磊,沈冰,单磊,任聪,闻海虎.Sizable Residual Quasiparticle Density of States Induced by Impurity Scattering Effect in Ba（Fe1-xCox）2As2 Single Crystals[J].中国物理快报,2010(3):278-281. |
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| 作者姓名： | 牟刚 曾斌 程鹏 王钊胜 方磊 沈冰 单磊 任聪 闻海虎 |
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| 作者单位： | National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratozy for Condensed Matter Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100190 |
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| 基金项目： | Supported by the National Natural Science Foundation of China, the National Basic Research Program of China under Grant Nos 2006CB601000, 2006CB921107 and 2006CB921802, and the ITSNEM Project of Chinese Academy of Sciences. |
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| 摘 要： | Low-temperature specific heat Cp is measured on Ba（Fe1-xCox）2As2 single crystals in a wide doping region. A sizeable residual specific heat coefficient γo is observed in the low temperature limit of all samples. The specific heat jump near Tc, i.e. ΔCp/T／T_c, is also determined. It is found that -γo, ΔCp/T／T_c and Tc all share a similar evolution with doping. These can be well understood within the model of S± pairing symmetry when accounting for the cobalt-dopants as unitary scattering centers in the FeAs planes. Our results reveal a non-trivial impact of impurity scattering in FeAs-based.
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| 关 键 词： | 杂质散射 专题 剩余 单晶 态密度 准粒子 Ba 诱导 |
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