REVIEWS OF TOPICAL PROBLEMS

Magnetic superconductors

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© 1984 American Institute of Physics
, , Citation Aleksandr I Buzdin et al 1984 Sov. Phys. Usp. 27 927 DOI 10.1070/PU1984v027n12ABEH004085

0038-5670/27/12/927

Abstract

Superconductivity and ferromagnetism are antagonistic types of ordering, and their mutual effects give rise to several interesting phenomena which have recently been studied in rare earth compounds. A theoretical analysis shows that while a ferromagnetic superconductor is a type II superconductor near the superconducting transition point Tc1, it becomes a type I superconductor near the ferromagnetic transition point TM. A new theory derived for the case TMTc1 predicts the formation of a transverse domain-like magnetic structure near TM. In clean superconductors the electron spectrum is gapless. A change in the behavior from type II to type I upon cooling to TM has been observed experimentally in ErRh4B4. Experimental data on ErRh4B4, HoMo6S8 and HoMo6Se8 prove the existence of superconductivity and a magnetic ordering below TM.

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10.1070/PU1984v027n12ABEH004085