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

doi:10.1103/PhysRevLett.109.137005

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

International Center for Synchrotron Radiation Innovation Smart (SRIS)

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12 Citations (Scopus)

Abstract

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 language	English
Article number	137005
Journal	Physical Review Letters
Volume	109
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.109.137005
Publication status	Published - 2012 Sept 28

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10.1103/PhysRevLett.109.137005

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title = "Measurement of magnetic exchange in ferromagnet-superconductor La 2/3Ca 1/3MnO 3/YBa 2Cu 3O 7 bilayers",

abstract = "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.",

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AU - Giblin, S. R.

AU - Taylor, J. W.

AU - Duffy, J. A.

AU - Butchers, M. W.

AU - Utfeld, C.

AU - Dugdale, S. B.

AU - Nakamura, T.

AU - Visani, C.

AU - Santamaria, J.

PY - 2012/9/28

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AB - 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.

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Measurement of magnetic exchange in ferromagnet-superconductor La _2/3Ca _1/3MnO ₃/YBa ₂Cu ₃O ₇ bilayers

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