Stoner enhanced paramagnetic influence on superconductivity in a superconductor/metallic heterostructure

详细信息    查看全文

• 作者：S.J. Ray^a ; ^{ray.sjr@gmail.com} ; S.J. Lister^a ; S.L. Lee^a ; Olav Hellwig^b ; J. Stahn^c
• 关键词：Thin film ; PNR ; Coexistence of Superconductivity and Magnetism ; Superconductivity ; Magnetism ; Stoner enhancement
• 刊名：Physica C
• 出版年：2013
• 出版时间：15 April, 2013
• 年：2013
• 卷：487
• 期：Complete
• 页码：67-71
• 全文大小：333 K

文摘

The unusual magnetic behaviour of a Pd/Nb₆₇Ti₃₃/Pd heterostructure was investigated using polarised neutron reflectivity technique. On application of a large in-plane magnetic field, Stoner enhanced paramagnet Pd was found to influence the magnetic state of the Nb₆₇Ti₃₃ layer both above and below the superconducting transition temperature T_c significantly. Unlike the case of a conventional proximity effect for a superconductor/metallic heterostructure, the pair correlation in the superconducting state has been found to be more stable in the higher field limit compared to its low field counterpart, possibly signaturing a ¡®novel¡¯ coupled state in the system. The superconducting state in Nb₆₇Ti₃₃ has been found to be diamagnetic in nature at all the fields that can be fitted using a Meissner kind of behaviour in the high field limit. The magnetic properties of Pd and Nb₆₇Ti₃₃ are in excellent agreement with those measured using bulk magnetisation measurements.