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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2002, Volume 75, Issue 11, Pages 699–702
(Mi jetpl3129)
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This article is cited in 3 scientific papers (total in 3 papers)
CONDENSED MATTER
Anisotropy of the superconducting transition in magnetic fields in a Nd$_{1.85}$Ce$_{0.15}$CuO$_4$ single crystal
G. Kh. Panovaa, A. A. Shikova, N. A. Chernoplekova, G. A. Emel'chenkob, A. N. Malukb, C. T. Linc a Russian Research Centre "Kurchatov Institute", Moscow
b Institute of Solid State Physics, Russian Academy of Sciences
c Max-Planck-Institut fur Festkorperforschung
Abstract:
The anisotropy of superconducting properties of a Nd$_{1.85}$Ce$_{0.15}$CuO$_4$ single crystal is studied by resistance measurements over the temperature range 2-30 K in magnetic fields of 0, 1, 2, 4, and 6 $T$ parallel to the $a-b$ plane. A strong anisotropy of $T_c(H)$ and $H_{c2}(T)$ is observed for different orientations of magnetic field in the $a-b$ plane. This anisotropy leads to a twofold symmetry of $T_c(H)$ and $H_{c2}(T)$, and the gap node direction is determined. An analysis of experimental data shows that this result can be attributed to a change in the local symmetry of the copper atom environment, which manifests itself as a reduction from tetragonal to orthorhombic symmetry in the low-temperature region. The comparison with La$_{1.85}$Sr$_{0.15}$CuO$_4$ suggests that the mechanisms of superconductivity in electron and hole doped superconductors are similar, and the difference observed in the experiment is related to the structural features of these materials.
Received: 06.05.2002
Citation:
G. Kh. Panova, A. A. Shikov, N. A. Chernoplekov, G. A. Emel'chenko, A. N. Maluk, C. T. Lin, “Anisotropy of the superconducting transition in magnetic fields in a Nd$_{1.85}$Ce$_{0.15}$CuO$_4$ single crystal”, Pis'ma v Zh. Èksper. Teoret. Fiz., 75:11 (2002), 699–702; JETP Letters, 75:11 (2002), 579–582
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https://www.mathnet.ru/eng/jetpl3129 https://www.mathnet.ru/eng/jetpl/v75/i11/p699
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Abstract page: | 118 | Full-text PDF : | 42 | References: | 27 |
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