Field Dependence of the Ground State in the Exotic Superconductor CeCoIn5: A Nuclear Magnetic Resonance Investigation
G. Koutroulakis, V. F. Mitrović, M. Horvatić, C. Berthier, G. Lapertot, J. Flouquet
DOI 10.1103/PhysRevLett.101.047004 · Physical Review Letters
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Abstract
We report In115 nuclear magnetic resonance (NMR) measurements in CeCoIn5 at low temperature (T≈70 mK) as a function of the magnetic field (H0) from 2 to 13.5 T applied perpendicular to the c^ axis. A NMR line shift reveals that below 10 T the spin susceptibility increases as H0. We associate this with an increase of the density of states due to the Zeeman and Doppler-shifted quasiparticles extended outside the vortex cores in a d-wave superconductor. Above 10 T a new superconducting state is stabilized, possibly the modulated phase predicted by Fulde, Ferrell, Larkin, and Ovchinnikov. This phase is clearly identified by a strong and linear increase of the NMR shift with the field, before a jump at the first order transition to the normal state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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