Upper critical field in electron-doped cuprate superconductor Nd2−xCexCuO4+δ: Two-gap model

► Resistivity measurements of the Hc2(T) were determined for electron-doped superconductors. ► Two types of Hc2(T) dependences are observed: with a positive curvature of Hc2(T) and conventional WHH curve. ► We have demonstrated that the two-band/two-gap model captures the essence of the behavior of...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2013-05, Vol.488, p.25-29
Main Authors: Charikova, T.B., Shelushinina, N.G., Harus, G.I., Petukhov, D.S., Neverov, V.N., Ivanov, A.A.
Format: Article
Language:English
Subjects:
Cuprate superconductors
Two-gap model
Upper critical field
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Summary:► Resistivity measurements of the Hc2(T) were determined for electron-doped superconductors. ► Two types of Hc2(T) dependences are observed: with a positive curvature of Hc2(T) and conventional WHH curve. ► We have demonstrated that the two-band/two-gap model captures the essence of the behavior of Hc2(T) for investigated systems. We present resistivity measurements of the upper critical field (Hc2) phase diagram as a function of temperature (T) for Nd1.85Ce0.15CuO4+δ/SrTiO3 single crystal films with different degree of disorder (δ) in magnetic fields up to 90 kOe at temperatures down to 0.4K. The data are well described by a two-band/two-gap model for a superconductor in the dirty limit.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2013.02.010