Theory of Interplay of Nuclear Magnetism and Superconductivity in AuIn2

Details Theory of Interplay of Nuclear Magnetism and Superconductivity in AuIn2 Theory of Interplay of Nuclear Magnetism and Superconductivity in AuIn2

1997-06-11

arxiv.org/abs/cond-mat/9706111v1

Physics

Condensed Matter

Superconductivity

4 pages with 2 PS figures, RevTeX, submitted to Physical Review B - Rapid Communications

Scientific paper

10.1103/PhysRevB.56.R11415

The recently reported coexistence of a magnetic order, with the critical temperature T_M=35 \mu*K, and superconductivity, with the critical temperature T_S=207 m*K, in AuIn_2 is studied theoretically. It is shown that superconducting (S) electrons and localized nuclear magnetic moments (LM's) interact dominantly via the contact hyperfine (EX) interaction, giving rise to a spiral (or domain-like) magnetic order in superconducting phase. The electromagnetic interaction between LM's and S electrons is small compared to the EX one giving minor contribution to the formation of the oscillatory magnetic order. In clean samples (l>\xi_0) of AuIn$_2$ the oscillatory magnetic order should produce a line of nodes in the quasiparticle spectrum of S electrons giving rise to the power law behavior. The critical field H_c(T=0) in the coexistence phase is reduced by factor two with respect to its bare value.

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