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Magnetic field alignment of high-T c superconductorsRBa2Cu3O7–δ (R=rare earth)

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Abstract

Finely ground powders ofRBa2Cu3O7 − δ (R=Y, Nd, Sm, Eu, Dy, Ho, Er, Tm, Yb) have been mixed at dilute 3%-by-volume concentrations into epoxy matrices which were then allowed to harden in applied magnetic fieldsH A=18 kOe. X-ray diffractometry studies and 4.3 K measurements of supercurrent-induced magnetization hysteresisΔM are interpreted as indicating at least partial alignment of single-crystal-grain c-axes (1) parallel toH A forR=Y, Nd, Sm, Dy, Ho (as earlier found by Farrell et al. forR=Y), and (2) perpendicular toH A forR=Eu, Er, Tm, Yb. With a few exceptions (Y, Sm, Eu) the alignment direction correlates with the sign of the second-order Stevens factorα J of the crystalline electric field Hamiltonian in the manner suggested by Livingston et al. For the best aligned specimens (Ho, Dy) critical current densitiesJ c (4.3 K, 5 kOe) for individual grains are estimated fromΔM and the Bean model to be of order 107 A/cm2 for the measuring fieldH parallel to the original alignment fieldH A, and of order 106 A/cm2 forH perpendicular toH A.

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Authors and Affiliations

  1. Department of Physics and Institute for Pure and Applied Physical Sciences, University of California, 92093, San Diego, La Jolla, CA, USA

    J. M. Ferreira, M. B. Maple, H. Zhou, R. R. Hake, B. W. Lee & C. L. Seaman

  2. Department of Physics, Tufts University, 02155, Medford, MA, USA

    M. V. Kuric & R. P. Guertin

  3. Departamento de Fisica, Universidade Federal de Pernambuco, 50739, Recife, Brazil

    J. M. Ferreira

  4. Department of Physics, Indiana University, 47405, Bloomington, IN, USA

    R. R. Hake

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  1. J. M. Ferreira
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  2. M. B. Maple
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  3. H. Zhou
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  4. R. R. Hake
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  5. B. W. Lee
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  6. C. L. Seaman
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  7. M. V. Kuric
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  8. R. P. Guertin
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Ferreira, J.M., Maple, M.B., Zhou, H. et al. Magnetic field alignment of high-T c superconductorsRBa2Cu3O7–δ (R=rare earth). Appl. Phys. A 47, 105–110 (1988). https://doi.org/10.1007/BF00619708

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  • DOI: https://doi.org/10.1007/BF00619708

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