Anomalous NMR Magnetic Shifts in CeCoIn5
Abstract
We report 115In and 59Co Nuclear Magnetic Resonance (NMR) measurements in the heavy fermion superconductor CeCoIn5 above and below Tc. 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 Tc the spin susceptibility is suppressed, indicating singlet pairing.
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