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

被引：15

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

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 13期

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.

引用

页数：5

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