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1984

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December

  

Reviews of topical problems


Magnetic superconductors

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 $T_\mathrm{c1}$, it becomes a type I superconductor near the ferromagnetic transition point $T_\mathrm{M}$. A new theory derived for the case $T_\mathrm{M}\ll T_\mathrm{c1}$ predicts the formation of a transverse domain-like magnetic structure near $T_\mathrm{M}$. 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 ErRh$_4$B$_4$. Experimental data on ErRh$_4$B$_4$, HoMo$_6$Se$_8$ and HoMo$_6$Se$_8$ prove the existence of superconductivity and a magnetic ordering below $T_\mathrm{M}$.

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Fulltext is also available at DOI: 10.1070/PU1984v027n12ABEH004085
PACS: 74.25.Ha, 74.25.Op, 74.25.Dw, 74.40.+k, 74.70.Dd (all)
DOI: 10.1070/PU1984v027n12ABEH004085
URL: https://ufn.ru/en/articles/1984/12/b/
Citation: Buzdin A I, Bulaevskii L N, Kulich M L, Panyukov S V "Magnetic superconductors" Sov. Phys. Usp. 27 927–953 (1984)
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Оригинал: Буздин А И, Булаевский Л Н, Кулич М Л, Панюков С В «Магнитные сверхпроводники» УФН 144 597–641 (1984); DOI: 10.3367/UFNr.0144.198412b.0597

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