Особливості переходів метал–ізолятор, багатошарове фазове розділення та пов’язані ефекти в купратах, легованих дірками

Автор(и)

  • S. Dzhumanov Institute of Nuclear Physics, Uzbek Academy of Sciences
  • I. Khidirov Institute of Nuclear Physics, Uzbek Academy of Sciences
  • U. T. Kurbanov Institute of Nuclear Physics, Uzbek Academy of Sciences
  • Z. S. Khudayberdiev Institute of Nuclear Physics, Uzbek Academy of Sciences
  • J. Sh. Rashidov Institute of Nuclear Physics, Uzbek Academy of Sciences

DOI:

https://doi.org/10.15407/ujpe64.4.322

Ключові слова:

hole-doped cuprates, metal-insulator transitions, multiscale phase separation, doping-dependent electronic properties

Анотація

Вивчаються особливостi переходiв метал–iзолятор, багатошарове фазове роздiлення та еволюцiя спiвiснуючих iзоляцiйних та металевих/надпровiдних фаз у купратах, легованих дiрками. Ми показуємо, як цi взаємопов’язанi явища i пов’язанi з ними ефекти проявляються в широкому дiапазонi вiд низького до оптимального легування цих систем, де локалiзованi i рухомi носiї дiрок знаходяться в бiдних (iзолюючих) i багатих на дiрки (металевi або надпровiднi) областях. Ми стверджуємо, що невеликi дiлянки багатi на дiрки (тобто вузькi нанорозмiрнi металевi острови або смуги) можуть зберiгатися в iзолюючiй фазi слабо легованих купратiв, тодi як конкуруючi iзоляцiйнi, металевi та надпровiднi фази будуть спiвiснувати в слабо легованих купратах. Коли рiвень легування збiльшується далi, дiлянки бiднi на дiрки (або iзолюючi зони) поступово звужуються вiд макро- до нанорозмiрних iзолюючих смуг i зникають в оптимально легованих купратах. Наочно продемонстровано, що переходи метал–iзолятор i спiвiснуючi iзоляцiйнi та металевi/надпровiднi фази проявляються в пригнiченнi надпровiдностi в слабо легованих купратах та в рiзнiй температурно-залежнiй поведiнцi магнiтної сприйнятливостi i опору в напрямку с-осi для купратiв в iнтервалi вiд низького до оптимального рiвня легування.

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2019-05-16

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Dzhumanov, S., Khidirov, I., Kurbanov, U. T., Khudayberdiev, Z. S., & Rashidov, J. S. (2019). Особливості переходів метал–ізолятор, багатошарове фазове розділення та пов’язані ефекти в купратах, легованих дірками. Український фізичний журнал, 64(4), 322. https://doi.org/10.15407/ujpe64.4.322

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