In-plane anisotropy of vortex-lattice melting in large YBa2Cu3O7 single crystals

被引:40
作者
Ishida, T [1 ]
Okuda, K
Rykov, AI
Tajima, S
Terasaki, I
机构
[1] Univ Osaka Prefecture, Dept Phys & Elect, Osaka 5998531, Japan
[2] ISTEC, SRL, Koto Ku, Tokyo 135, Japan
[3] Waseda Univ, Dept Appl Phys, Shinjuku Ku, Tokyo 169, Japan
来源
PHYSICAL REVIEW B | 1998年 / 58卷 / 09期
关键词
D O I
10.1103/PhysRevB.58.5222
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The vortex-lattice melting transition of a large untwinned YBa2Cu3O7 crystal(T-c=91.6 K) in the case of H parallel to c axis appears as a jump in de magnetization M-dc at a melting transition T-m and an abrupt transition in the ac susceptibility chi(ac) above T-m. Similarly, M-dc shows a jump at T-m in the H parallel to b and H parallel to a configurations, indicating that a first-order-melting transition occurs in a highly compressed vortex lattice. This is reinforced by a lattice softening in chi(ac) below T-m and a sharp transition above T-m. The melting lines fitted by PI = H-0(1-T/T-c)(1.5) give the relations H-0(parallel to a)/H-0(parallel to c) = 7.241+/-0.09, H-0(parallel to b)/H-0(parallel to c) = 8.93+/-0.12, and H-0(parallel to b)/H-0(parallel to a) = 1.23+/-0.01. These are in excellent agreement with the anisotropy parameters gamma(ca) = root m(c)/m(a) = 7.44 +/- 0.25, gamma(cb) = root m(c)/m(b) = 8.79 +/- 0.21, and gamma(ab) = root m(a)/m(b) = 1.18 +/- 0.05.
引用
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页码:5222 / 5225
页数:4
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