Coupled superconducting and magnetic order in CeCoIn5
Coupled superconducting and magnetic order in CeCoIn5
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DOI：
10.1126/science.1161818
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发表时间：
2008-09-19
期刊：
影响因子：
56.9
通讯作者：
Thompson, J. D.
中科院分区：
文献类型：
--
作者：
Kenzelmann, M.;Straessle, Th.;Thompson, J. D.
强磁涨落可以提供电子的耦合机制，导致非常规的超导性。磁有序和超导性在许多磁介导超导体中共存，但这些有序参数通常相互竞争。我们报告说，接近上临界场，CeCoIn 5采用多组分基态，同时进行合作的磁性和超导订单。在上临界场的一级跃迁中抑制超导性导致磁序的同时崩溃，表明超导性是磁序所必需的。对磁序和超导能隙函数之间耦合的对称性分析表明，超导性的一种形式与非零动量有关。
Strong magnetic fluctuations can provide a coupling mechanism for electrons that leads to unconventional superconductivity. Magnetic order and superconductivity have been found to coexist in a number of magnetically mediated superconductors, but these order parameters generally compete. We report that close to the upper critical field, CeCoIn5 adopts a multicomponent ground state that simultaneously carries cooperating magnetic and superconducting orders. Suppressing superconductivity in a first- order transition at the upper critical field leads to the simultaneous collapse of the magnetic order, showing that superconductivity is necessary for the magnetic order. A symmetry analysis of the coupling between the magnetic order and the superconducting gap function suggests a form of superconductivity that is associated with a nonvanishing momentum.