Antiferromagnetic order oriented by Fulde-Ferrell-Larkin-Ovchinnikov superconducting order

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Resolving the high-field superconducting phase (HFSP), often called as the Q-phase, and the antiferromagnetic or spin-density-wave (SDW) order appearing in the phase remains a crucial issue on the superconductor CeCoIn$_5$. It is shown that a switching of the SDW domain due to a tiny change of the magnetic field direction in HFSP, reported and interpreted as an evidence of the presence of a $��$-triplet pairing inducing the SDW order [S. Gerber et al., Nature Physics 10, 126 (2014)], can be explained with no triplet pairing component if the $d$-wave superconducting order in HFSP includes the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) modulation parallel to the field. This result corroborates the picture that HFSP of CeCoIn$_5$ and the SDW order found only in the phase are consequences of the strong paramagnetic pair-breaking in this $d$-wave superconductor.

8 pages, 4 figures. figure 1 was divided, appendix was added, and some revisions were made. the version accepted for publication in Phys. Rev. B

Journal

  • Physical Review B

    Physical Review B 91 (9), 094504-, 2015-03-06

    American Physical Society (APS)

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