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Measurement of Magnetic Exchange in Ferromagnet-Superconductor La2/3Ca1/3MnO3/YBa2Cu3O7 Bilayers

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.

preprint2012arXivOpen access
S. R. GiblinJ. W. TaylorJ. A. DuffyM. W. ButchersC. UtfeldS. B. DugdaleT. NakamuraC. VisaniJ. Santamaria
cond-mat.supr-concond-mat.str-el
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Open access9 authors2 topics
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S. R. GiblinJ. W. TaylorJ. A. DuffyM. W. ButchersC. UtfeldS. B. DugdaleT. NakamuraC. VisaniJ. Santamaria

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