Effect of a magnetic field up to 9 T on the temperature dependence of the pseudogap in YBa2Cu3O7–δ films
DOI (Low Temperature Physics):
https://doi.org/10.1063/10.0042157Ключові слова:
high-temperature superconductors, YBCO films, excess conductivity, fluctuation conductivity, magnetic field, coherence length, pseudogapАнотація
Проаналізовано вплив магнітного поля B до 9 Тл вздовж осі с (B ‖ с) на питомий опір ρ(T), флуктуаційну провідність σʹ (T) та псевдощілину Δ*(T) у тонких плівках YBa2Cu3O7–δ з критичною температурою надпровідного переходу Tc = 88,8 К. На відміну від попередньої роботи (Low Temp. Phys. 51, 1061 (2025) [Fiz. Nyzk. Temp. 51, 1180 (2025)]), де магнітне поле було спрямоване вздовж площини ab (B ‖ ab), вплив поля на зразок сильніший завдяки внеску як спін-орбітального, так і зеєманівського ефектів. Як і очікувалося, магнітне поле не впливає на ρ(T) у нормальному стані. Однак, при надпровідному переході магнітне поле В різко збільшує питомий опір ρ(T), ширину надпровідного переходу ΔTc та довжину когерентності вздовж осі c, ξc(0), але водночас зменшує як Tc, так і діапазон надпровідних флуктуацій ΔTfl. Флуктуаційна провідність виявляє перехід при характерній температурі T0: від тривимірної теорії Асламазова–Ларкіна (3D–AL) поблизу Tc до двовимірної теорії флуктуацій Макі–Томпсона (2D–MT). Проте при B = 1 Tл внесок 2D–MT повністю пригнічується, і вище T0 залежність σʹ (T) несподівано описується внеском 2D–AL флуктуацій, що вказує на формування двовимірної вихрової решітки в плівці під дією магнітного поля. Виявлено, що температура переходу BEC–BCS, Tpair, яка відповідає максимуму залежності Δ*(T), зміщується в область нижчих температур зі збільшенням B, а максимальне значення Δ*(Tpair) зменшується в полях B > 5 T. Встановлено, що зі збільшенням поля низькотемпературний максимум поблизу T0 розмивається та зникає при B > 1 T. Крім того, вище температури Гінзбурга TG, для B > 1 T, на Δ*(T) при Tmin з'являється мінімум, який стає дуже виразним з подальшим збільшенням B. Внаслідок цього загальне значення Δ*(TG) помітно зменшується, найімовірніше, через ефект розриву пар. Водночас ΔТfl та ξс(0) різко зростають приблизно в три рази зі збільшенням B вище 1 T. Отримані результати підтверджують можливість формування вихрового стану в YBa2Cu3O7–δ магнітним полем та його еволюцію зі збільшенням B.
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