Theoretical model for the superconducting and magnetically ordered borocarbides

Details Theoretical model for the superconducting and magnetically ordered borocarbides Theoretical model for the superconducting and magnetically ordered borocarbides

1999-10-15

arxiv.org/abs/cond-mat/9910229v2

Phys. Rev. Lett. 84, 1800 (2000)

Physics

Condensed Matter

Superconductivity

8 pages, 2 figures. Published version, one important reference added

Scientific paper

10.1103/PhysRevLett.84.1800

We present a theory of superconductivity in presence of a general magnetic structure in a form suitable for the description of complex magnetic phases encountered in borocarbides. The theory, complemented with some details of the band structure and with the magnetic phase diagram, may explain the nearly reentrant behaviour and the anisotropy of the upper critical field of HoNi2B2C. The onset of the helical magnetic order depresses superconductivity via the reduction of the interaction between phonons and electrons caused by the formation of magnetic Bloch states. At mean field level, no additional suppression of superconductivity is introduced by the incommensurability of the helical phase.

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