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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
REFERENCES
D. Saint-James, G. Sarma, and E. J. Thomas, Type II Superconductivity (Pergamon, New York, 1969).
E. Helfand and N. R. Werthamer, Phys. Rev. Lett. 13, 686 (1964).
E. S. Caixeiro, J. L. Gonzalez, and E. V. L. de Mello, Phys. Rev. B 64, 024521 (2004).
R. Ikeda, Phys. Rev. B 74, 054510 (2006).
L. N. Bulaevskii and M. V. Sadovskii, J. Low Temp. Phys. 59, 89 (1985).
G. Kotliar and A. Kapitulnik, Phys. Rev. B 33, 3146 (1986).
M. A. Skvortsov and M. V. Feigel’man, Phys. Rev. Lett. 95, 057002 (2005).
M. V. Feigel’man, L. B. Ioffe, and M. Mezard, Phys. Rev. B 82, 184534 (2010).
M. A. Skvortsov and M. V. Feigel’man, Phys. Rev. Lett. 109, 147002 (2012).
I. S. Burmistrov, I. V. Gornyi, and A. D. Mirlin, Phys. Rev. Lett. 108, 017002 (2012).
I. S. Burmistrov, I. V. Gornyi, and A. D. Mirlin, Phys. Rev. B 92, 014506 (2015).
V. M. Galitski and A. I. Larkin, Phys. Rev. Lett. 87, 087001 (2001).
A. A. Kopasov, D. A. Savinov, and A. S. Mel’nikov, Radiophys. Quantum Electron. 59, 911 (2017).
A. A. Kopasov, D. A. Savinov, and A. S. Mel’nikov, Phys. Rev. B 95, 104520 (2017).
Yu. N. Drozdov, D. V. Masterov, S. A. Pavlov, A. E. Parafin, and P. A. Yunin, Tech. Phys. 60, 1682 (2015).
A. I. Larkin, Sov. Phys. JETP 2, 205 (1965).
C. Xiaowen, W. Zhihe, and Xu Xiaojun, Phys. Rev. B 65, 064521 (2002).
A. F. Hebard and M. A. Paalanen, Phys. Rev. B 30, 4063 (1984).
ACKNOWLEDGMENTS
The authors are very grateful to A.S. Mel’nikov for stimulating discussions of the results of this work and also to V.K. Vasiliev for his technical support with ion implantation. The authors are also grateful to V.V. Kurin, V.I. Gav-rilenko, D.Yu. Vodolazov, A.Yu. Aladyshkin, and S.V. Sharov for valuable comments.
Funding
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. This work was carried out using the facilities of the Common Research Center “Physics and Technology of Micro- and Nanostructures” of IPMRAS.
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
The authors declare that they do not have conflicts of interest.
Additional information
Translated by Yu. Ryzhkov
Rights and permissions
About this article
Cite this article
Antonov, A.V., Ikonnikov, A.V., Masterov, D.V. et al. Phase Diagrams of Thin Disordered Films Based on HTSC YBa2Cu3O7 – x in External Magnetic Fields. Phys. Solid State 61, 1523–1528 (2019). https://doi.org/10.1134/S1063783419090026
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1063783419090026