Microscopic evidence for field-induced magnetism in CeCoIn${}_5$

Abstract

We present NMR data in the normal and superconducting states of CeCoIn${}_5$ for fields close to $H_{c2}(0)=11.8$ T in the $ab$ plane. Recent experiments identified a first-order transition from the normal to superconducting state for $H>10.5$ T, and a new thermodynamic phase below 290 mK within the superconducting state. We find that the Knight shifts of the In(1), In(2) and the Co are discontinuous across the first-order transition and the magnetic linewidths increase dramatically. The broadening differs for the three sites, unlike the expectation for an Abrikosov vortex lattice, and suggests the presence of static spin moments in the vortex cores. In the low-temperature and high-field phase the broad NMR lineshapes suggest ordered local moments, rather than a long wavelength quasiparticle spin density modulation expected for an FFLO phase.

4 pages, 4 figures. to appear in Phys. Rev. Lett

References in corpus (6)

• Hidden Magnetism and Quantum Criticality in the Heavy Fermion Superconductor CeRhIn5
• Reversible Tuning of the Heavy Fermion Ground State in CeCoIn${}_5$
• Observation of Spin Susceptibility Enhancement in the Possible FFLO State in CeCoIn${}_5$
• Field Dependent Coherence Length in the Superclean, High-Kappa Superconductor CeCoIn5
• Hyperfine Interactions in the Heavy Fermion CeMIn_5 Systems
• Fermi-liquid effects in the Fulde-Ferrell-Larkin-Ovchinnikov state of two-dimensional d-wave superconductors

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