COMPARISON OF HALL-EFFECT NEAR TC IN YBCO 123 SINGLE-CRYSTAL AND 124 CERAMICS

被引：18

作者：

AFFRONTE, M ^{[1
]}

DECROUX, M ^{[1
]}

SADOWSKI, W ^{[1
]}

GRAF, T ^{[1
]}

FISCHER, O ^{[1
]}

机构：

[1] ECOLE POLYTECH FED LAUSANNE,IMO,DEPT PHYS,CH-1015 LAUSANNE,SWITZERLAND

来源：

PHYSICA C | 1990年 / 172卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(90)90651-T

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have measured the Hall voltage V(H) as a function of temperature and magnetic field B (up to 6 T) near T(c) in Y1Ba2Cu3O7-delta-("123") single crystal and in Y1Ba2Cu4O8 ("124") ceramics. Near T(c), V(H) shows a sign reversal in the 123 crystal (B parallel to the c-axis) and the tangents to the V(H) versus B curves at 6 T do not cross the origin. These features are not observed in the 124 phase. The fact that a negative V(H) appears in the 123 phase and not in 124 seems to reflect different conditions for the flux flow dynamics in the two compounds. We also report measurements of the normal state Hall coefficient, R(H) obtained in single phase 124 ceramics. The very small value of R(H) (1.5 x 10(-10)m3/C for T > 140 K) is rather unusual in the superconducting oxide family.

引用

页码：131 / 137

页数：7

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