Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-06-23
Phys. Rev. Lett. 101, 047004 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, to appear in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.101.047004
We report $^{115}$In nuclear magnetic resonance (NMR) measurements in CeCoIn$_5$ at low temperature ($T \approx 70$ mK) as a function of magnetic field ($H_0$) from 2 T to 13.5 T applied perpendicular to the $\hat c$-axis. NMR line shift reveals that below 10 T the spin susceptibility increases as $\sqrt{H_0}$. 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 (FFLO). 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.
Berthier Claude
Flouquet Jacques
Horvatic Mladen
Koutroulakis G.
Lapertot Gerard
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