Anomalous NMR Magnetic Shifts in CeCoIn_5
arXiv:cond-mat/0105175 · doi:10.1103/PhysRevB.64.180514
Abstract
We report ^{115}In and ^{59}Co Nuclear Magnetic Resonance (NMR) measurements in the heavy fermion superconductor CeCoIn_5 above and below T_c. The hyperfine couplings of the In and Co are anisotropic and exhibit dramatic changes below 50K due to changes in the crystal field level populations of the Ce ions. Below T_c the spin susceptibility is suppressed, indicating singlet pairing.
4 pages, 4 figures