Hydrostatic pressure effect on the pseudogap in Y0.77Pr0.23Ba2Cu3O7–δ single crystals

Автор(и)

  • A. L. Solovjov B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
    Department of Physics, LUT University, Lappeenranta 53850, Finland
    Institute for Low Temperatures and Structure Research of PAS, Wroclaw 50-422, Poland
  • L. V. Bludova B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
  • A. S. Kolesnik B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
  • E. V. Petrenko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
  • N. V. Shytov B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
  • A. Sedda Department of Physics, LUT University, Lappeenranta 53850, Finland
  • E. Lähderanta Department of Physics, LUT University, Lappeenranta 53850, Finland
  • D. Sergeyev K. Zhubanov Aktobe Regional University, 030000 Aktobe, Kazakhstan
  • R. V. Vovk Physics Department, V. N. Karazin Kharkiv National University, Kharkiv 61022, Ukraine

DOI (Low Temperature Physics):


https://doi.org/10.1063/10.0043141

Ключові слова:

high-temperature superconductors, praseodymium doping, resistivity, superconducting transition temperature, fluctuation conductivity, pseudogap

Анотація

Значні зусилля для з’ясування властивостей високотемпературних надпровідників (HTSCs) були докладені з використанням гідростатичного тиску (HP). Досліджено зміни питомого опору ρ(T), температури надпровідного переходу Tc, флуктуаційної провідності σ′(T) та псевдощілини Δ*(T) монокристала Y1-xPrxBa2Cu3O7–δ (YPrBCO) (x = 0,23) під впливом HP до ~1,1 ГПа. Було виявлено, що дефекти, створені магнітними включеннями PrBa2C3O7–δ (PrBCO), відіграють значну роль у поведінці зразка. Також виявлено найбільше зменшення ρ(T) залежно від HP зі швидкістю d ln ρ(100 K)/dP = = – (29 ± 0,2) %·ГПа–1. Це вказує на те, що механізми впливу HP на ρ(T) та Tc монокристалів YPrBCO та YBa2C3O7–δ є різними. З аналізу псевдощілини було виявлено, що механізм взаємодії носіїв заряду з магнітними домішками PrBCO змінюється тричі зі збільшенням HP. Відносно низький HP, до ~0,5 ГПа, сприяє утворенню дефектів, спричинених магнітними включеннями PrBCO. Починаючи з ~ 6 ГПа HP нейтралізує вплив магнітних домішок, і магнітний максимум на Δ*(T) зникає. Вище ~1,0 ГПа HP вирівнює магнітні моменти PrBCO, і магнітний максимум знову з’являється на Δ*(T), більш виражений, ніж при P = 0. Порівняння з теорією Петерса–Бауера показало, що локальна щільність пар у HTSCs дійсно зростає зі збільшенням тиску.

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2026-02-25

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A. L. Solovjov, L. V. Bludova, A. S. Kolesnik, E. V. Petrenko, N. V. Shytov, A. Sedda, E. Lähderanta, D. Sergeyev, and R. V. Vovk, Hydrostatic pressure effect on the pseudogap in Y0.77Pr0.23Ba2Cu3O7–δ single crystals , Low Temp. Phys. 52, 425–436, (2026) [Fiz. Nyzk. Temp. 52, 475–487, (2026)] DOI: https://doi.org/10.1063/10.0043141.

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Том 52 № 4 (2026)

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