Anisotropic Spin Fluctuations in Heavy-Fermion Superconductor CeCoIn5: In-NQR and Co-NMR Studies

We report In-NQR and Co-NMR experiments of CeCoIn 5 that undergoes a superconducting transition with a record high T c = 2.3 K to date among heavy-fermion superconductors. At zero magnetic field, a...