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arXiv 0910.0353cond-mat.str-elcond-mat.supr-con
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重费米子化合物CeCoIn5的场诱导耦合超导性和自旋密度波序

Field-induced coupled superconductivity and spin density wave order in the Heavy Fermion compound CeCoIn5

J. Spehling, R. H. Heffner, J. E. Sonier, N. Curro, C. H. Wang, B. Hitti, G. Morris, E. D. Bauer, J. L. Sarrao, F. J. Litterst, H. -H. Klauss

摘要:

本文用横向场μ子自旋转动测量方法研究了CeCoIn_5的高场超导态,外加场平行于晶体学c轴,接近上临界场Hc_2 = 4.97T。在磁场>= 4.8 T时,μ介子的Knight位移增强,超导转变从二阶向一阶转变,这与对Pauli极限超导体的预测一致。横向μ子自旋弛豫速率σ的场和温度依赖性揭示了在2 T < H < 4.8 T的场区中顺磁自旋涨落。在正常状态下,接近Hc2的自洽重整化理论所描述的相关自旋涨落的观察。结果支持的模式耦合的超导和反铁磁有序相CeCoIn 5的H方向平行于c轴的形成。

英文摘要:

The high field superconducting state in CeCoIn5 has been studied by transverse field muon spin rotation measurements with an applied field parallel to the crystallographic c-axis close to the upper critical field Hc2 = 4.97 T. At magnetic fields >= 4.8 T the muon Knight shift is enhanced and the superconducting transition changes from second order towards first order as predicted for Pauli-limited superconductors. The field and temperature dependence of the transverse muon spin relaxation rate sigma reveal paramagnetic spin fluctuations in the field regime from 2 T < H < 4.8 T. In the normal state close to Hc2 correlated spin fluctuations as described by the self consistent renormalization theory are observed. The results support the formation of a mode-coupled superconducting and antiferromagnetically ordered phase in CeCoIn5 for H directed parallel to the c-axis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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