FEATURES OF THE CURRENT-VOLTAGE CHARACTERISTICS OF LAYERED HIGH-TEMPERATURE SUPERCONDUCTORS

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Abstract

The paper presents the results of measurements of the current-voltage characteristics (IVC’s) in the electron-doped layered superconductor Nd2–xCexCuO4 and the results of the scaling analysis of the U(I) dependence for a large set of layered HTSC’s. It is shown that the IVC’s of hole-doped compounds indicate a monotonic behavior of the d-wave symmetry order parameter, while the IVC’s of electron-doped compounds Nd2–xCexCuO4 with x = 0.15 and Sm2–xCexCuO4 exhibit a non-monotonic nature of the d-wave symmetry order parameter associated with the coexistence of superconductivity and fluctuations of antiferromagnetic spin excitations.

About the authors

Tatiana B. Charikova

Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences

Email: charikova@imp.uran.ru
Russian Federation, Ekaterinburg, 620108 Russia

Nina G. Shelushinina

Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences

Email: shel@imp.uran.ru
Russian Federation, Ekaterinburg, 620108 Russia

Vladimir N. Neverov

Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences

Email: neverov@imp.uran.ru
Russian Federation, Ekaterinburg, 620108 Russia

Mikhail R. Popov

Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences

Author for correspondence.
Email: popov_mr@imp.uran.ru

кандидат физико-математических наук, старший научный сотрудник лаборатории полупроводников и полуметаллов

Russian Federation, Ekaterinburg, 620108 Russia

Andrei A. Ivanov

National Research Nuclear University MEPhI

Email: aaivanov@mephi.ru
Russian Federation, Moscow, 115409 Russia

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