Abstract:
An unusual decrease in the slope of the upper critical field near Tc0 at a gradual increase in the ion implantation dose has been experimentally observed in narrow bridges formed on the base of thin HTSC YBa2Cu3O7−x films, while an increase in the defect concentration usually leads to an increase in the local slope of the phase transition line Hc2(T). In addition, it has been found that the temperature dependence of the upper critical field has a positive curvature near Tc0. 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.
Keywords:
thin HTSC films, resistive measurements in magnetic field, ion implantation, the Ginzburg–Landau theory with a nonuniform coherence length.
This work was supported by the Russian Foundation for Basic research (project no. 18-42-520051), the program of the Presidium of the Russian Academy of Sciences (RAS) I.1 “Fundamental problems of high-temperature superconductivity,” and also the state program of IPM RAS for 2019.
Citation:
A. V. Antonov, A. V. Ikonnikov, D. V. Masterov, A. N. Mikhaylov, S. V. Morozov, Yu. N. Nozdrin, S. A. Pavlov, A. E. Parafin, D. I. Tetelbaum, S. S. Ustavshchikov, P. A. Yunin, D. A. Savinov, “Phase diagrams of thin disordered films based on HTSC YBa2Cu3O7−x in external magnetic fields”, Fizika Tverdogo Tela, 61:9 (2019), 1573–1578; Phys. Solid State, 61:9 (2019), 1523–1528
\Bibitem{AntIkoMas19}
\by A.~V.~Antonov, A.~V.~Ikonnikov, D.~V.~Masterov, A.~N.~Mikhaylov, S.~V.~Morozov, Yu.~N.~Nozdrin, S.~A.~Pavlov, A.~E.~Parafin, D.~I.~Tetelbaum, S.~S.~Ustavshchikov, P.~A.~Yunin, D.~A.~Savinov
\paper Phase diagrams of thin disordered films based on HTSC YBa$_{2}$Cu$_{3}$O$_{7-x}$ in external magnetic fields
\jour Fizika Tverdogo Tela
\yr 2019
\vol 61
\issue 9
\pages 1573--1578
\mathnet{http://mi.mathnet.ru/ftt8689}
\crossref{https://doi.org/10.21883/FTT.2019.09.48091.11N}
\elib{https://elibrary.ru/item.asp?id=41130243}
\transl
\jour Phys. Solid State
\yr 2019
\vol 61
\issue 9
\pages 1523--1528
\crossref{https://doi.org/10.1134/S1063783419090026}
Linking options:
https://www.mathnet.ru/eng/ftt8689
https://www.mathnet.ru/eng/ftt/v61/i9/p1573
This publication is cited in the following 4 articles:
A. A. Kopasov, I. M. Tsar'kov, A. S. Mel'nikov, “Disorder-induced trapping and antitrapping of vortices in type-II superconductors”, Phys. Rev. B, 107:17 (2023)
A. I. Podlivaev, I. A. Rudnev, “On magnetometric determination of the radiation defect concentration in a superconducting GdBa2Cu3O7−x”, Phys. Solid State, 63:6 (2021), 888–896
A.V. Antonov, A.V. Ikonnikov, D.V. Masterov, A.N. Mikhaylov, S.V. Morozov, Yu. N.Nozdrin, S.A. Pavlov, A.E. Parafin, D.I. Tetel'baum, S.S. Ustavschikov, V.K. Vasiliev, P.A. Yunin, D.A. Savinov, “Critical-field slope reduction and upward curvature of the phase-transition lines of thin disordered superconducting YBa2Cu3O7-x films in strong magnetic fields”, Physica C: Superconductivity and its Applications, 568 (2020), 1353581
A. V. Antonov, A. I. Elkina, V. K. Vasil'ev, M. A. Galin, D. V. Masterov, A. N. Mikhaylov, S. V. Morozov, S. A. Pavlov, A. E. Parafin, D. I. Tetelbaum, S. S. Ustavshchikov, P. A. Yunin, D. A. Savinov, “Experimental observation of s-component of superconducting pairing in thin disordered HTSC films based on YBCO”, Phys. Solid State, 62:9 (2020), 1598–1603