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arXiv 0901.2758cond-mat.supr-con
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非常规超导体中零能量密度的场角依赖性:硼碳化物超导体YNi2B2C的分析

Field angle dependence of the zero-energy density of states in unconventional superconductors: analysis of the borocarbide superconductor YNi2B2C

Yuki Nagai, Nobuhiko Hayashi, Yusuke Kato, Kunihiko Yamauchi, Hisatomo Harima

摘要:

利用能带计算得到的真实费米面,研究了YNi_2B_2C的零态能量密度随场角的变化.第17和第18波段都被考虑在内。为了计算振荡态密度,我们采用Kramer-Pesch近似,这被发现可以提高振荡幅度的精度。我们表明,通过分析STM实验确定的超导能隙结构与热输运和热容测量是一致的。

英文摘要:

We investigate the field-angle-dependent zero-energy density of states for YNi2B2C with using realistic Fermi surfaces obtained by band calculations. Both the 17th and 18th bands are taken into account. For calculating the oscillating density of states, we adopt the Kramer-Pesch approximation, which is found to improve accuracy in the oscillation amplitude. We show that superconducting gap structure determined by analyzing STM experiments is consistent with thermal transport and heat capacity measurements.

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