Observation of Spin Susceptibility Enhancement in the Possible FFLO State in CeCoIn$_5$ - Archive ouverte HAL
Article Dans Une Revue Physical Review Letters Année : 2006

Observation of Spin Susceptibility Enhancement in the Possible FFLO State in CeCoIn$_5$

Résumé

We report $^{115}$In nuclear magnetic resonance (NMR) measurements of the heavy-fermion superconductor CeCoIn$_5$ in the vicinity of the superconducting critical field $H_{c2}$ for a magnetic field applied perpendicular to the $\hat c$-axis. A possible inhomogeneous superconducting state, Fulde-Ferrel-Larkin-Ovchinnikov (FFLO), is stabilized in this part of the phase diagram. In 11 T applied magnetic field, we observe clear signatures of the two phase transitions: the higher temperature one to the homogeneous superconducting state and the lower temperature phase transition to a FFLO state. It is found that the spin susceptibility in the putative FFLO state is significantly enhanced as compared to the value in a homogeneous superconducting state. Implications of this finding for the nature of the low temperature phase are discussed.

Dates et versions

hal-00269078 , version 1 (02-04-2008)

Identifiants

Citer

V. F. Mitrovic, M. Horvatic, C. Berthier, G. Knebel, G. Lapertot, et al.. Observation of Spin Susceptibility Enhancement in the Possible FFLO State in CeCoIn$_5$. Physical Review Letters, 2006, 97 (11), pp.117002. ⟨10.1103/PhysRevLett.97.117002⟩. ⟨hal-00269078⟩
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