Open AccessSTUDIES ON ANISOTROPY FOR SINGLE-CRYSTAL GdBa2Cu3O7-δ
Author(s) -
Fang Minghu,
Xia Jiansheng,
XU ZHU-AN,
Zhao Zhan-chun,
Sun Dunming,
Zuyao Chen,
Qian Yitai,
Zhang Qirui
Publication year - 1989
Publication title -
acta physica sinica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.38.313
Subject(s) - condensed matter physics , anisotropy , superconductivity , electrical resistivity and conductivity , shielding effect , conductance , plane (geometry) , single crystal , crystal (programming language) , physics , materials science , electromagnetic shielding , nuclear magnetic resonance , quantum mechanics , geometry , mathematics , computer science , programming language
We report the experimental results on anisotropy of the normal state resistivity, transition temperature and magnetic transition in single crystal GdBa2Cu3O7-δ. We find that both ρ∥ and ρ⊥ are fitted very well to the Anderson-Zou relationship ρ = A/T + BT, except near Tc where fluctuation enhanced conductance becomes prominent. The striking difference in A, B of two directions suggests that charge transport proceeds by different mechanisms in the two directions, that the system exhibit remarkable two-dimensional character in the normal stete. The superconductivity in the c direction is weaker than that in ab plane: Tce⊥ is 2K lower than Tce∥. a. c. magnetic shielding effect when H∥ab plane is only 76% of that as H⊥ab plane.
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