Paramagnetic effect tuned by magnetic pinning in YBa2Cu3O7-δ/La0.67Sr0.33MnO3 heterostructures
Research Center for Superconductors and Applied Technologies, Physics Department, Shanghai University Shanghai, 200444, China
2 State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences - Shanghai 200050, China
Accepted: 18 January 2010
In the present heterostructure of YBa2Cu3O7-δ/La0.67Sr0.33MnO3 (YBCO/LSMO), a paramagnetic moment is observed, increasing monotonically with enhancing applied-field strength during the field-cooled (FC) magnetization process. Such a paramagnetic effect, however, emerges only in those samples where manganite layers are magnetically inhomogeneous, probably arising from the flux compression in the FC process. It is supposed that the flux compression occurs as a result of the strong magnetic pinning, caused by the stress-induced ferromagnetic/antiferromagnetic (FM/AFM) phase separation in the constituent layer of LSMO.
PACS: 74.78.Fk – Multilayer, superlattices, heterostructures / 74.72.-h – Cuprate superconductors / 75.70.Cn – Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
© EPLA, 2010