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

被引:14
作者
Giblin, S. R. [1 ]
Taylor, J. W. [1 ]
Duffy, J. A. [2 ]
Butchers, M. W. [2 ]
Utfeld, C. [3 ]
Dugdale, S. B. [3 ]
Nakamura, T. [4 ]
Visani, C. [5 ]
Santamaria, J. [5 ]
机构
[1] Rutherford Appleton Lab, ISIS Facil, Chilton OX11 0QX, Oxon, England
[2] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England
[3] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England
[4] SPring 8, Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, Japan
[5] Univ Complutense Madrid, Dept Fis Aplicada, GFMC, E-28040 Madrid, Spain
基金
英国工程与自然科学研究理事会;
关键词
RAY CIRCULAR-DICHROISM; COPPER-OXIDE METALS; PSEUDOGAP; INTERFACE;
D O I
10.1103/PhysRevLett.109.137005
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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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页数:5
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