open access

https://hdl.handle.net/2115/17116

Fulde-Ferrell-Larkin-Ovchinnikov State in a Perpendicular Field of Quasi-Two-Dimensional CeCoIn5

英語

2006

American Physical Society

Physical Review Letters

97(22)

227002

A Fulde-Ferrell-Larkin-Ovchinnkov (FFLO) state was previously reported in the quasi-2D heavy fermion CeCoIn5 when a magnetic field was applied parallel to the ab plane. Here, we conduct 115In NMR studies of this material in a perpendicular field, and provide strong evidence for FFLO in this case as well. Although the topology of the phase transition lines in the H-T phase diagram is identical for both configurations, there are several remarkable differences between them. Compared to H k ab, the FFLO phase 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 a temperature dependence. Moreover, directing H ⊥ ab results in a notable change in the quasiparticle excitation spectrum within the planar node associated with the FFLO transition.

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Copyright © 2006 American Physical Society

0031-9007

1079-7114