Antiferromagnetic ordering induced by paramagnetic depairing in unconventional superconductors

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Description

Antiferromagnetic (AFM) (or spin-density wave) quantum critical fluctuation enhanced just below H_c2(0) have been often observed in d-wave superconductors with a strong Pauli paramagnetic depairing (PD) including CeCoIn_5. It is shown here that such a tendency of field-induced AFM ordering is a consequence of strong PD and should appear particularly in superconductors with a gap node along the AFM modulation. Two phenomena seen in CeCoIn_5, the anomalous vortex lattice form factor and the AFM order in the Fulde-Ferrell-Larkin-Ovchinnikov state, are explained based on this peculiar PD effect.

4 pages, 3 figures Title and text were changed. References are added. Resubmitted version

Journal

  • Physical Review B

    Physical Review B 82 (6), 060510-, 2010-08-12

    American Physical Society (APS)

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