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

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


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
Issue number13
Publication statusPublished - 2012 Sep 28
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Measurement of magnetic exchange in ferromagnet-superconductor La <sub>2/3</sub>Ca <sub>1/3</sub>MnO <sub>3</sub>/YBa <sub>2</sub>Cu <sub>3</sub>O <sub>7</sub> bilayers'. Together they form a unique fingerprint.

Cite this