Theory of an inherent spin-density-wave instability due to vortices in superconductors with strong Pauli effects

Kenta M. Suzuki, Masanori Ichioka, Kazushige Machida

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Abstract

A spin-density-wave (SDW) instability mechanism enhanced by vortices under fields is proposed to explain the high field and low-temperature phase in CeCoIn 5. In the vortex state strong Pauli effect and nodal gap conspire to enhance the momentum-resolved density of states over the normal state value exclusively along the nodal direction, providing a favorable nesting condition for SDW with Q=(2k F,2k F,0.5) only at high fields (H). We can consistently understand observed mysteries of the field-induced SDW confined below H c2, such as facts that Q is directed to the nodal direction independent of H, SDW diminishes under tilting field from the ab plane, and the SDW transition line in (H,T) has a positive slope.

Original languageEnglish
Article number140503
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number14
DOIs
Publication statusPublished - Apr 8 2011

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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