2012
DOI: 10.1103/physrevlett.109.116402
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Quasiparticle Entropy in the High-Field Superconducting Phase ofCeCoIn5

Abstract: The heavy-fermion superconductor CeCoIn5 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 ≥ 100 mK and fields H ≤ 12 T aligned along different directions. For any of these conditions, we do not observe an additional entropy contribution upon tuning at constant temperature by magnetic field … Show more

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Cited by 24 publications
(28 citation statements)
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“…Recently, the first-order phase transition was, as far as we know, first observed in thermal conductivity measurements of CeCoIn 5 , 81 indicating that superconductivity is dominated by Pauli paramagnetism. This conclusion was also confirmed by the step-like features of the specific heat, 65,89 magnetization, 48,90 magnetocaloric, 91 and thermal expansion measurements.…”
Section: Pauli-limited Superconductivity Fflo State and Q-phasesupporting
confidence: 64%
“…Recently, the first-order phase transition was, as far as we know, first observed in thermal conductivity measurements of CeCoIn 5 , 81 indicating that superconductivity is dominated by Pauli paramagnetism. This conclusion was also confirmed by the step-like features of the specific heat, 65,89 magnetization, 48,90 magnetocaloric, 91 and thermal expansion measurements.…”
Section: Pauli-limited Superconductivity Fflo State and Q-phasesupporting
confidence: 64%
“…A second anomaly is the heat capacity that has been observed within the superconducting phase. However, the phase found between the normal metal and the homogeneous superconductor show features expected rather from the antiferromagnetically ordered phase than from FFLO (for example, thermodynamic experiments showed an entropy decrease while shifting from the homogeneous phase to that one [54]). Nevertheless, recent measurements revealed an additional order intertwined with another one, probably an FFLO state [55,56].…”
Section: Introductionmentioning
confidence: 97%
“…Moreover, Γ also changes sign close to a quantum critical point, and the sign changes reveal the locations of entropy acummulation [3]. Measurements of Γ [4,5,6,7] and its magnetic counterpart, the magnetocaloric effect [8,9,10,11,12,13], have proven useful in the investigation of various quantum critical systems, see Refs. [14,15,16] for reviews.…”
Section: Introductionmentioning
confidence: 99%