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Zero-field quantum critical point in CeCoIn5
Y Tokiwa1, E D Bauer2, P Gegenwart1
1I. Physikalisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany.
Abstract:
Quantum criticality in the normal and superconducting states of the heavy-fermion metal CeCoIn5 is studied by measurements of the magnetic Grüneisen ratio ΓH and specific heat in different field orientations and temperatures down to 50 mK. A universal temperature over magnetic field scaling of ΓH in the normal state indicates a hidden quantum critical point at zero field. Within the superconducting state, the quasiparticle entropy at constant temperature increases upon reducing the field towards zero, providing additional evidence for zero-field quantum criticality.
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