期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.137005
关键词
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资金
- EPSRC (UK) [EP/G056463/1]
- Spanish MICINN [MAT 2008 06517, CSD2009-00013, CAM S2009/MAT-1756]
- Engineering and Physical Sciences Research Council [EP/G056463/1, EP/F021518/1] Funding Source: researchfish
- EPSRC [EP/F021518/1, EP/G056463/1] Funding Source: UKRI
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.
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