Giblin, S., Taylor, J., Duffy, J. A., Butchers, M., Utfeld, C., Dugdale, S., Nakamura, T., Visani, C. and Santamaria, J. (2012) Measurement of magnetic exchange in ferromagnet-superconductor La_{2/3}Ca_{1/3}MnO_{3}/YBa_{2}Cu_{3}O_{7} Bilayers. Physical Review Letters, Vol.109 (No.13). Article no. 137005. doi:10.1103/PhysRevLett.109.137005 ISSN 0031-9007.

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Abstract

The existence of coherent magnetic correlations in the normal phase of cuprate high-temperature superconductors has proven difficult to measure directly. Here we report on a study of ferromagnetic-superconductor bilayers of La2/3Ca1/3MnO3/YBa2Cu3O7 (LCMO/YBCO) with varying YBCO layer thicknesses. Using x-ray magnetic circular dichroism, we demonstrate that the ferromagnetic layer induces a Cu magnetic moment in the adjacent high-temperature superconductor. For thin samples, this moment exists at all temperatures below the Curie temperature of the LCMO layer. However, for a YBCO layer thicker than 12 unit cells, the Cu moment is suppressed for temperatures above the superconducting transition, suggesting this to be a direct measurement of magnetic coherence in the normal state of a superconducting oxide.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Official Date:	2012
Dates:	Date Event 2012 UNSPECIFIED
Volume:	Vol.109
Number:	No.13
Page Range:	Article no. 137005
DOI:	10.1103/PhysRevLett.109.137005
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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