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Microwave observation of magnetic field penetration of high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconducting oxides

K. KhachaturyanDepartment of Materials Science and Mineral Engineering, University of California, Berkeley, California 94720E. R. WeberDepartment of Materials Science and Mineral Engineering, University of California, Berkeley, California 94720P. TejedorDepartment of Materials Science and Mineral Engineering, University of California, Berkeley, California 94720Angelica M. StacyDepartment of Materials Science and Mineral Engineering, University of California, Berkeley, California 94720A. M. PortisDepartment of Materials Science and Mineral Engineering, University of California, Berkeley, California 94720

1987lv

ABI

Annotatsiya

Microwave methods, using a conventional EPR spectrometer, have been applied to a study of magnetic field penetration of the high-${T}_{c}$ superconducting oxides ${\mathrm{La}}_{1.85}$${\mathrm{Sr}}_{0.15}$Cu${\mathrm{O}}_{4}$, Y${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$, and Eu${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$. Signals over ${10}^{5}$ times the sensitivity limit of the EPR spectrometer were obtained. Huge low-field peaks were observed in the superconducting phase for magnetic fields below 10 G. The peak signal decreased exponentially with temperature just below ${T}_{c}$. These observations are taken as evidence of the spin-glass features of these materials and of fluxoid penetration of intrinsic Josephson junctions.

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DOI: 10.1103/physrevb.36.8309

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