Магнетокалоричний ефект у спін-1/2 одновимірній XX моделі з двома регулярнозмінними g-факторами

Автор(и)

  • O.R. Baran Institute for Condensed Matter Physics, Nat. Acad. of Sci. of Ukraine

DOI:

https://doi.org/10.15407/ujpe68.7.488

Ключові слова:

одновимiрнi квантовi спiновi моделi, g-фактор, фермiонiзацiя Йордана–Вiґнера, магнетокалоричний ефект, квантовий фазовий перехiд

Анотація

Дослiджено вплив неоднорiдностi g-факторiв, коли вони є регулярнозмiнними з перiодом два, на магнетокалоричний ефект у спiн-1/2 XX ланцюжку в поперечному магнiтному полi. За допомогою перетворення Йордана–Вiґнера задача зводиться до гамiльтонiана невзаємодiючих безспiнових фермiонiв i розв’язується точно. Проаналiзовано, як змiнюються iзоентропи та польовi залежностi параметра Грюнайзена зi змiною g2/g1. Основна увага придiляється низько-температурнiй областi. Показано вiдмiнностi магнетокалоричного ефекту у випадках, коли g-фактори мають однаковi та рiзнi знаки, а також коли один iз g-факторiв дорiвнює нулю.

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Опубліковано

2023-09-08

Як цитувати

Baran, O. (2023). Магнетокалоричний ефект у спін-1/2 одновимірній XX моделі з двома регулярнозмінними g-факторами. Український фізичний журнал, 68(7), 488. https://doi.org/10.15407/ujpe68.7.488

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Фізика магнітних явищ і фізика фероїків