Nedavno bylo ustanovleno, chto sverkhprovodyashchii effekt blizosti sil'no podavlen v neuporyadochennom antiferromagnetike, nesmotrya na otsutstvie tam makroskopicheskogo obmennogo polya, vyzyvayushchego rasshcheplenie energii elektronov, v zavisimosti ot napravleniya ikh spina. Po etoi prichine dzhozefsonovskie kontakty, gde v kachestve slaboi svyazi vystupayut antiferromagnitnye metally, propuskayut tok, tol'ko esli rasstoyanie mezhdu sverkhprovodyashchimi kontaktami malo. Odnako kriticheskii tok mozhet nablyudat'sya i na ból'shikh rasstoyaniyakh, esli parnye sverkhprovodyashchie korrelyatsii v antiferromagnetike imeyut primes' tripletnykh sostoyanii, takikh, chto spiny kuperovskikh par okazyvayutsya perpendikulyarny napravleniyu neelevskogo poryadka. Takogo tipa korrelyatsii mogut pronikat' otnositel'no gluboko vnutr' antiferromagnetika.

V dannoi rabote pokazano, chto magnitnye vozbuzhdeniya (magnony) antiferromagnetika, peredavaya svoi orbital'nyi moment elektronam provodimosti, sposobstvuyut prevrashcheniyu singletnykh sostoyanii v tripletnye. Blagodarya etomu, kriticheskii tok v planarnykh dzhozefsonovskikh kontaktakh mozhet nablyudat'sya i na otnositel'no bol'shikh rasstoyaniyakh mezhdu kontaktami. V kachestve istochnika teragertsovogo kogerentnogo magnitnogo vozbuzhdeniya byl rassmotren antiferromagnitnyi nanoostsillyator, nakhodyashchiisya v pryamom kontakte s antiferromagnetikom v dzhozefsonovskom kontakte.

1. A. G. Mal’shukov, Magnon-induced transparency of a disordered antiferromagnetic Josephson junction, doi.org/10.48550/arXiv.2507.0951