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Effective pinning centers for flux lines in oxide superconductors with YBCO structure

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
222
Identifiers
DOI: 10.1016/0921-4534(94)90549-5
Disciplines
  • Physics

Abstract

Abstract The magnetic hysteresis loops of YBa 2Cu 3O y , Ln 1+ x Ba 2- x Cu 3O y (Ln=Sm, Nd) and YBa 2(Cu 1- x Fe x ) 3O y systems were measured by a superconducting quantum interference device (SQUID) magnetometer, and the relationship between the microscopic structure and effectiveness of pinning centers for the flux lines is discussed. The oxygen vacancies and disordered oxygens in the Cu1-O planes cannot act as effective pinning centers, while the iron cluster in the Cu1-O planes in the YBa 2(Cu 1- x Fe x ) 3 O y system, which is produced during the reduction in flowing N 2 gas at high temperature, is effective for flux pinning.

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