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arXiv 1209.0834cond-mat.supr-con
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泡利极限非常规超导体的磁序结构

Structure of magnetic order in Pauli limited unconventional superconductors

Yasuyuki Kato, C. D. Batista, I. Vekhter

摘要:

我们分析了泡利极限d波超导体中塞曼耦合到磁场诱导的反铁磁有序的磁结构。我们确定在H-T平面的相图,并发现,磁相,这是稳定在低温和低于上临界场,可以有两个实现主要取决于下面的费米面的形状。双Q磁序可以在整个共存范围内持续存在。或者,可能存在从较低场的双Q结构到较高场的单Q调制的弱一阶跃迁。连同计算的NMR线的形状,这些结果表明第二种情况作为一个严重的候选人描述的超导状态的CeCoIn 5。

英文摘要:

We analyse the magnetic structure of the antiferromagnetic order induced in Pauli limited d-wave superconductors by Zeeman coupling to magnetic field. We determine the phase diagram in the H-T plane, and find that the magnetic phase, which is stabilized at low temperatures and just below the upper critical field, can have two realizations depending primarily on the shape of the underlying Fermi surface. The double-Q magnetic ordering may persist over the entire coexistence range. Alternatively, there may exist a weak first order transition from a double-Q structure at lower fields to a single-Q modulation at higher fields. Together with the calculations of the NMR line-shape these results suggest the second scenario as a serious candidate for describing the superconducting state of CeCoIn5.

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