Journal of Low Temperature Physics

, Volume 69, Issue 5–6, pp 419–450 | Cite as

Magnetic field-induced superconductivity in the ferromagnetic state of HoMo6S8

  • M. Giroud
  • J. -L. Genicon
  • R. Tournier
  • C. Geantet
  • O. Peña
  • R. Horyn
  • M. Sergent
Article

Abstract

The Chevrel-phase HoMo6S8 is one of the few known ferromagnetic reentrant superconductors, having an upper superconductive critical temperatureT c1 =1.78 K, a Curie temperatureT m =0.75 K, and reentering into a normal ferromagnetic state belowT c2 =0.64 K. After a brief survey of the characteristic properties of HoMo6S8, we present new results obtained by simultaneous resistance and magnetization measurements on a single crystal of HoMo6S8, performed in the whole temperature range 35mK≤T≤4.2 K and for several orientations of the easy magnetization axis with respect to the applied magnetic field. Magnetic field-induced superconductive transitions are observed well belowT c2 in the ferromagnetic state. Those transitions can be understood as the first experimental observation of a purely electromagnetic effect earlier suggested by Ginzburg: if the internal field is antiparallel to the spontaneous magnetization, the magnetic induction may be reduced below its critical value and a superconductive transition may take place. It is possible if exchange interactions are negligible; our results concerning the anisotropy of the internal upper critical fieldH c2 are consistent with that requirement. We also discuss the possible origins for the low-resistance state in zero field: it might be due to domain wall superconductivity.

Keywords

Magnetic Field Anisotropy Domain Wall Exchange Interaction Magnetic Induction 

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Copyright information

© Plenum Publishing Corporation 1987

Authors and Affiliations

  • M. Giroud
    • 1
  • J. -L. Genicon
    • 1
  • R. Tournier
    • 1
  • C. Geantet
    • 2
  • O. Peña
    • 2
  • R. Horyn
    • 2
  • M. Sergent
    • 2
  1. 1.Centre de Recherches sur les Très Basses Températures, CNRSGrenobleFrance
  2. 2.Laboratoire de Chimie MinéraleUniversité de Rennes IRennesFrance

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