Unconventional superconductivity and antiferromagnetic spin fluctuations in the heavy fermion compound CeCoIn5: 115In-NQR study under pressure
Abstract
We report systematic evolution of superconducting (SC) characteristic of heavy-fermion superconductor CeCoIn5 via the nuclear-quadrupole-resonance (NQR) measurement under pressure (P). The temperature dependence of nuclear spin-lattice relaxation rate (1/T1) below TC has revealed that once the value of SC energy gap (2∆0/kBTC) slightly increases in P<0.45 GPa, with further increasing P, it decreases significantly. By contrast, TC increases monotonously up to 2.6 K as P increases up to 1 GPa, exhibiting a saturation in P=1.0-1.5 GPa.
- Publication:
-
Journal of Magnetism and Magnetic Materials
- Pub Date:
- May 2004
- DOI:
- 10.1016/j.jmmm.2003.11.335
- Bibcode:
- 2004JMMM..272E.679Y
- Keywords:
-
- Heavy fermions;
- Superconductivity;
- Pressure effect;
- Nuclear quadrupole resonance
