Open AccessОтличительные особенности фазовых диаграмм тонких неупорядоченных пленок на основе ВТСП YBa-=SUB=-2-=/SUB=-Cu-=SUB=-3-=/SUB=-O-=SUB=-7-x-=/SUB=- во внешних магнитных полях
Author(s) -
А.В. Антонов,
А.В. Иконников,
Д.В. Мастеров,
А.Н. Михайлов,
С.В. Морозов,
Ю. Н. Ноздрин,
С.А. Павлов,
А.Е. Парафин,
Д.И. Тетельбаум,
С.С. Уставщиков,
П.А. Юнин,
Д.А. Савинов
Publication year - 2019
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2019.09.48091.11n
Subject(s) - condensed matter physics , superconductivity , curvature , critical field , materials science , field (mathematics) , critical current , interpretation (philosophy) , transition temperature , physics , geometry , mathematics , pure mathematics , computer science , programming language
An unusual decrease in the slope of the upper critical field near T _ c 0 at a gradual increase in the ion implantation dose has been experimentally observed in narrow bridges formed on the base of thin HTSC YBa_2Cu_3O_7 – _ x films, while an increase in the defect concentration usually leads to an increase in the local slope of the phase transition line H _ c 2( T ). In addition, it has been found that the temperature dependence of the upper critical field has a positive curvature near T _ c 0. A possible theoretical interpretation of the results is proposed. It is based on the modified Ginzburg–Landau theory with a nonuniform length of superconducting correlations.