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arXiv · 1203.5567

Quasiparticle entropy in the high-field superconducting phase of CeCoIn$_5$

Y. Tokiwa·E. D. Bauer·P. Gegenwart
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Abstract

The heavy-fermion superconductor CeCoIn$_5$ displays an additional transition within its superconducting (SC) state, whose nature is characterized by high-precision studies of the isothermal field dependence of the entropy, derived from combined specific heat and magnetocaloric effect measurements at temperatures $T\geq 100$ mK and fields $H\leq 12$ T aligned parallel, perpendicular and $18^\circ$ off the tetragonal [100] direction. For any of these conditions, we do not observe an additional entropy contribution upon tuning at constant temperature by magnetic field from the homogeneous SC into the presumed Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) SC state. By contrast, for $H\parallel [100]$ a negative isothermal entropy contribution, compatible with spin-density-wave (SDW) ordering, is found. Our data exclude the formation of a FFLO state in CeCoIn$_5$ for out-of-plane field directions, where no SDW order exists.

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Y. Tokiwa, E. D. Bauer, P. Gegenwart. 2013-06-22. Quasiparticle entropy in the high-field superconducting phase of CeCoIn$_5$. https://doi.org/10.1103/physrevlett.109.116402

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