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

B. -L. Young; R. R. Urbano; N. J. Curro; J. D. Thompson; J. L. Sarrao; A. B. Vorontsov; M. J. Graf

doi:10.1103/PhysRevLett.98.036402

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

Strongly Correlated Electrons 2013-05-29 v2 Superconductivity

Authors: B. -L. Young , R. R. Urbano , N. J. Curro , J. D. Thompson , J. L. Sarrao , A. B. Vorontsov , M. J. Graf

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Abstract

We present NMR data in the normal and superconducting states of CeCoIn $_5$ for fields close to $H_{\rm c2}(0)=11.8$ 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.

Keywords

CeCoIn5 NMR field-induced magnetism first-order transition vortex cores Knight shift FFLO phase

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@article{arxiv.cond-mat/0608040,
  title  = {Microscopic evidence for field-induced magnetism in CeCoIn$_5$},
  author = {B. -L. Young and R. R. Urbano and N. J. Curro and J. D. Thompson and J. L. Sarrao and A. B. Vorontsov and M. J. Graf},
  journal= {arXiv preprint arXiv:cond-mat/0608040},
  year   = {2013}
}

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

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

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