Zero-Field Quantum Critical Point in CeCoIn5
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- September 2013
- DOI:
- 10.1103/PhysRevLett.111.107003
- arXiv:
- arXiv:1306.3472
- Bibcode:
- 2013PhRvL.111j7003T
- Keywords:
-
- 74.40.Kb;
- 74.70.Tx;
- Heavy-fermion superconductors;
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Superconductivity
- E-Print:
- submitted to PRL