Бозе–ейнштейнівський конденсат магнонів і суперструми в широкому інтервалі температур

Автор(и)

  • L. Mihalceanu Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universit¨at Kaiserslautern
  • D. A. Bozhko Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universit¨at Kaiserslautern, James Watt School of Engineering, University of Glasgow
  • V. I. Vasyuchka Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universit¨at Kaiserslautern
  • A. A. Serga Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universit¨at Kaiserslautern
  • B. Hillebrands Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universit¨at Kaiserslautern
  • A. Pomyalov Department of Chemical and Biological Physics, Weizmann Institute of Science
  • V. S. L'vov Department of Chemical and Biological Physics, Weizmann Institute of Science
  • V. S. Tyberkevych Department of Physics, Oakland University

DOI:

https://doi.org/10.15407/ujpe64.10.927

Ключові слова:

magnon gas, parametric pumping, Bose–Einstein condensate, magnon superfluidity, magnon supercurrent, yttrium iron garnet (YIG)

Анотація

Магноннi бозе-ейнштейнiвськi конденсати (БЕК) та суперструми – це когерентнi квантовi явища, що виникають на макроскопiчному масштабi в параметрично заселених спiнових системах в твердих тiлах. Одна з найбiльш захоплюючих та привабливих рис цих процесiв – можливiсть магнонної конденсацiї та збудження суперструмiв навiть при кiмнатнiй температурi. Водночас, цiнна iнформацiя про магноннi конденсати, така як час життя, порiг формування i ступiнь когерентностi, може бути отримана в експериментах, проведених при рiзних температурах. Ми використовуємо спектроскопiю брiллюенiвського розсiяння свiтла (БРС) для вивчення динамiки БЕК магнонiв в монокристалiчнiй плiвцi залiзо-iтрiєвого гранату в широкому iнтервалi температур вiд 30 K до 380 K. Порiвнюючи результати БРС з попереднiми надвисокочастотними вимiрами, ми виявили прямий зв’язок мiж затуханням конденсованих та параметрично iнжектованих магнонiв. Посилена динамiка суперструму зареєстрована при 180 К поблизу мiнiмуму затухання БЕК.

Біографія автора

L. Mihalceanu, Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universit¨at Kaiserslautern

УФЖ

Посилання

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Опубліковано

2019-11-01

Як цитувати

Mihalceanu, L., Bozhko, D. A., Vasyuchka, V. I., Serga, A. A., Hillebrands, B., Pomyalov, A., L’vov, V. S., & Tyberkevych, V. S. (2019). Бозе–ейнштейнівський конденсат магнонів і суперструми в широкому інтервалі температур. Український фізичний журнал, 64(10), 927. https://doi.org/10.15407/ujpe64.10.927

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Фізика магнітних явищ і фізика фероїків

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