Journal
PHYSICAL REVIEW LETTERS
Volume 89, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.89.137002
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The superconducting phase transition in heavy fermion CeCoIn5 (T-c=2.3 K in zero field) becomes first order when the magnetic field Hparallel to[001] is greater than 4.7 T, and the transition temperature is below T(0)approximate to0.31T(c). The change from second order at lower fields is reflected in strong sharpening of both specific heat and thermal expansion anomalies associated with the phase transition, a strong magnetocaloric effect, and a steplike change in the sample volume. This effect is due to Pauli limiting in a type-II superconductor, and was predicted theoretically in the mid-1960s.
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