Influence of d-wave symmetry on irreversibility line and critical current densities

S. Awaji; K. Watanabe

doi:10.1143/jjap.40.l1022

Influence of d-wave symmetry on irreversibility line and critical current densities

S. Awaji, K. Watanabe

High Field Laboratory for Superconducting Materials

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

The enhancement of the upper critical field, B_c2, in a low temperature and high magnetic field region has been proposed theoretically, due to the mixing of d_x2-y2- and d_xy-symmetries for two-dimensional (2D) d-wave superconductors. Based on the B_c2 enhancement theory, the irreversibility field, B_i, and the critical current density, J_c, for high-T_c superconductors were calculated using the power law of B_i α B_c2ⁿ. It is found that both B_i and J_c for chemical vapor deposition (CVD)-processed YBa₂Cu₃O₇ can be well interpreted by the present model. This fact suggests that the concave temperature dependences of B_i and J_c originate from B_c2 for 2D d-wave superconductors. Moreover, the qualitative temperature dependence of B_i for high-T_c superconductors changes slightly with the anisotropy but the value of B_i decreases drastically with increasing the anisotropic parameter γ².

Original language	English
Pages (from-to)	L1022-L1025
Journal	Japanese Journal of Applied Physics, Part 2: Letters
Volume	40
Issue number	10 A
DOIs	https://doi.org/10.1143/jjap.40.l1022
Publication status	Published - 2001 Oct 1

Keywords

Critical current
Irreversibility field
d-wave symmetry

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy (miscellaneous)
Physics and Astronomy(all)

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abstract = "The enhancement of the upper critical field, Bc2, in a low temperature and high magnetic field region has been proposed theoretically, due to the mixing of dx2-y2- and dxy-symmetries for two-dimensional (2D) d-wave superconductors. Based on the Bc2 enhancement theory, the irreversibility field, Bi, and the critical current density, Jc, for high-Tc superconductors were calculated using the power law of Bi α Bc2n. It is found that both Bi and Jc for chemical vapor deposition (CVD)-processed YBa2Cu3O7 can be well interpreted by the present model. This fact suggests that the concave temperature dependences of Bi and Jc originate from Bc2 for 2D d-wave superconductors. Moreover, the qualitative temperature dependence of Bi for high-Tc superconductors changes slightly with the anisotropy but the value of Bi decreases drastically with increasing the anisotropic parameter γ2.",

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AU - Watanabe, K.

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N2 - The enhancement of the upper critical field, Bc2, in a low temperature and high magnetic field region has been proposed theoretically, due to the mixing of dx2-y2- and dxy-symmetries for two-dimensional (2D) d-wave superconductors. Based on the Bc2 enhancement theory, the irreversibility field, Bi, and the critical current density, Jc, for high-Tc superconductors were calculated using the power law of Bi α Bc2n. It is found that both Bi and Jc for chemical vapor deposition (CVD)-processed YBa2Cu3O7 can be well interpreted by the present model. This fact suggests that the concave temperature dependences of Bi and Jc originate from Bc2 for 2D d-wave superconductors. Moreover, the qualitative temperature dependence of Bi for high-Tc superconductors changes slightly with the anisotropy but the value of Bi decreases drastically with increasing the anisotropic parameter γ2.

AB - The enhancement of the upper critical field, Bc2, in a low temperature and high magnetic field region has been proposed theoretically, due to the mixing of dx2-y2- and dxy-symmetries for two-dimensional (2D) d-wave superconductors. Based on the Bc2 enhancement theory, the irreversibility field, Bi, and the critical current density, Jc, for high-Tc superconductors were calculated using the power law of Bi α Bc2n. It is found that both Bi and Jc for chemical vapor deposition (CVD)-processed YBa2Cu3O7 can be well interpreted by the present model. This fact suggests that the concave temperature dependences of Bi and Jc originate from Bc2 for 2D d-wave superconductors. Moreover, the qualitative temperature dependence of Bi for high-Tc superconductors changes slightly with the anisotropy but the value of Bi decreases drastically with increasing the anisotropic parameter γ2.

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KW - Irreversibility field

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Influence of d-wave symmetry on irreversibility line and critical current densities

Abstract

Keywords

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