Measurement of magnetic exchange in ferromagnet-superconductor La 2/3Ca 1/3MnO 3/YBa 2Cu 3O 7 bilayers

S. R. Giblin, J. W. Taylor, J. A. Duffy, M. W. Butchers, C. Utfeld, S. B. Dugdale, T. Nakamura, C. Visani, J. Santamaria

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11 Citations (Scopus)

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 La 2/3Ca 1/3MnO 3/YBa 2Cu 3O 7 (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.

Original languageEnglish
Article number137005
JournalPhysical review letters
Volume109
Issue number13
DOIs
Publication statusPublished - 2012 Sep 28
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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