Magnetic Anisotropy in A High-Tc Superconductor YBa2Cu3O7-δ Single Crystal below Tc
- 1 March 1988
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 27 (3A) , L403
- https://doi.org/10.1143/jjap.27.l403
Abstract
We have measured the magnetic field dependence of magnetization of single-crystal YBa2Cu3O7-δ in detail in fields up to 5 kOe in the temperature range below T c, i.e., 93 K. Lower critical fields, H c1's, at which the magnetization deviates from linearity, are very anisotropic; H c1 ⊥(0) (perpendicular to the a b-plane) is 305 Oe and H c1 //(0) (parallel to the a b-plane) is 104 Oe. Both H c1 ⊥ and H c1 // decrease linearly with increasing temperature up to about T c. It is suggested that random oxygen defects in the Cu-O planes and chains are important for the high-J c type II superconductor YBa2Cu3O7-δ.Keywords
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