Superconductivity of domain walls in the ferromagnet HoMo6S 8

Abstract

We have performed various measurements on annealed powder samples derived from Ho1.2Mo6S8. We have observed a first magnetization curve outside the hysteresis cycle, sometimes a diamagnetic a.c. susceptibility in the ferromagnetic state, a large positive magnetoresistance which is not of magnetic origin, an hysteresis cycle of the magnetoresistance, a variation of the resistance with the current, simultaneous after-effects on the magnetization and on the resistance. We believe that these results can be related to some superconductivity inside domain walls and to the influence of that state on the resistivity and on the process of magnetization