Zero-field Quantum Critical Point in CeCoIn${}_5$

Abstract

Quantum criticality in the normal and superconducting state of the heavy-fermion metal CeCoIn${}_5$ is studied by measurements of the magnetic Grüneisen ratio, ${\Gamma }_H$, and specific heat in different field orientations and temperatures down to 50 mK. Universal temperature over magnetic field scaling of ${\Gamma }_H$ 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.

submitted to PRL

References in corpus (5)

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