Anomalous penetration of a magnetic field into ferromagnetic superconductors

A. Kotani, M. Tachiki, H. Matsumoto, H. Umezawa, Saburo Takahashi

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

An anomalous behavior of the magnetic induction B is theoretically predicted near the surface of a semi-infinite crystal of a ferromagnetic superconductor. By taking account of the persistent current and the rare-earth magnetic moments, we solve Maxwell's equation under the condition that an external magnetic field H0 is applied parallel to the surface. At high temperatures T,B decays monotonically, and the penetration depth decreases with decreasing T. When T becomes comparable to the exchange interaction energy, B begins to effect an oscillatory damping. By decreasing T further, we find that the oscillation amplitude of B becomes anomalously large, and BH0 near the surface diverges at a critical temperature, below which a spontaneous magnetization bound near the surface appears. The origin of the spontaneous surface magnetization is discussed on the basis of an effective exchange interaction, for which the original ferromagnetic exchange interaction is screened by the persistent current, but the screening effect is imperfect near the surface.

Original languageEnglish
Pages (from-to)5960-5973
Number of pages14
JournalPhysical Review B
Volume23
Issue number11
DOIs
Publication statusPublished - 1981 Jan 1

ASJC Scopus subject areas

  • Condensed Matter Physics

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