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Phys Rev Lett. 2013 Sep 6;111(10):107003. Epub 2013 Sep 4.

Zero-field quantum critical point in CeCoIn5.

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I. Physikalisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany.
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.


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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