Fulde-Ferrell-Larkin-Ovchinnikov State in a Perpendicular Field of Quasi-Two-Dimensional CeCoIn5
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概要
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A Fulde-Ferrell-Larkin-Ovchinnkov (FFLO) state was previously reported in the quasi-2D heavyfermion CeCoIn5 when a magnetic field was applied parallel to the ab plane. Here, we conduct 115InNMR studies of this material in a perpendicular field, and provide strong evidence for FFLO in this caseas well. Although the topology of the phase transition lines in the H-T phase diagram is identical for bothconfigurations, there are several remarkable differences between them. Compared to H k ab, the FFLOphase for H ⊥ ab is confined in a much narrower region at the low-T–high-H corner in the H-T plane,and the critical field separating the FFLO and non-FFLO superconducting states almost ceases to have atemperature dependence. Moreover, directing H ⊥ ab results in a notable change in the quasiparticleexcitation spectrum within the planar node associated with the FFLO transition.
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American Physical Society | 論文
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