Hydrostatic pressure effect on the pseudogap in Y0.77Pr0.23Ba2Cu3O7–δ single crystals
DOI (Low Temperature Physics):
https://doi.org/10.1063/10.0043141Ключові слова:
high-temperature superconductors, praseodymium doping, resistivity, superconducting transition temperature, fluctuation conductivity, pseudogapАнотація
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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