MAGNETIC-RELAXATION AND FLUX PINNING IN YBA2CU3O7-GAMMA-HIGH-TC OXIDE IRRADIATED BY 5.3 GEV PB IONS

被引：25

作者：

HARDY, V

GROULT, D

PROVOST, J

RAVEAU, B

机构：

[1] Laboratoire de Cristallographie et Sciences des Matériaux (CRISMAT) ISMRa, 14050 Caen Cedex, Bd du Maréchal Juin

来源：

PHYSICA C | 1992年 / 190卷 / 03期

关键词：

D O I：

10.1016/0921-4534(92)90609-G

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Critical current densities and pinning energies have been respectively inferred from hysteresis loops and magnetic relaxation measurements for YBa2Cu3O7-delta polycrystalline samples irradiated by 5.3 GeV Pb ions. Pb ions latent tracks induce a strong anisotropic effect on flux pinning and critical current density which exhibits a twentyfold increase at 77 K for a fluence of 3 x 10(11) cm-2 and a magnetic field of 2 T oriented parallel to the tracks. Large increases of the pinning energies are also observed but contrary to J(c)'s they do not depend on the magnetic field orientation with respect to the direction of the tracks. Pinning energies of 0.5 eV are thus inferred at 77 K for samples irradiated at phi-t = 10(11) Pb ions/cm2.

引用

页码：289 / 298

页数：10

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