FLUX PINNING IN NEUTRON-IRRADIATED YBA2CU3O7-X

被引：8

作者：

LESSURE, HS ^{[1
]}

SIMIZU, S ^{[1
]}

BAUMERT, BA ^{[1
]}

SANKAR, SG ^{[1
]}

MCHENRY, ME ^{[1
]}

MALEY, MP ^{[1
]}

COST, JR ^{[1
]}

WILLIS, JO ^{[1
]}

机构：

[1] UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545

来源：

IEEE TRANSACTIONS ON MAGNETICS | 1991年 / 27卷 / 02期

关键词：

D O I：

10.1109/20.133357

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Identical polycrystalline samples of YBa2Cu3O7-x have been irradiated with fast neutrons (E > 0.1 Mev) in eight steps between 0 and 2.1 x 10(18) n/cm2. Notable irradiation effects include a T(c) depression of nearly 2 K at the highest fluence and large improvements in the critical current density for fields from 0-9 and temperatures between 4-80 K. Critical currents approaching 2 x 10(7) A/cm2 are observed for optimally irradiated materials at 5K (in zero field) while at 77 K, J(c)(0kOe) approaches 5 x 10(5) A/cm2. Irradiation is seen to take a nearly equilibrium magnetization curve at 77 K and broaden it to a significantly hysteretic curve. A substantial shift in the effective pinning potential as a function of current density is inferred from magnetic relaxation measurements at H = 1T. This is the first such measurement in which systematically increased activation energies for flux creep (as a function of current density) are noted.

引用

页码：1043 / 1046

页数：4

共 17 条

[1] MAGNETIZATION OF HARD SUPERCONDUCTORS [J].