Diagnostics of superconductivity in La–Ba–Cu–O from luminescence spectra: comparison of optical and magnetic measurements
A. S. PanfilovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovYu. I. RybalkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. N. SamovarovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovI. V. SvechkarevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovA. I. SmirnovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovI. Ya. Fugol’Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
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Comparative measurements of emission spectra, magnetic susceptibility and resistive characteristics of La–Ba–Cu–O samples are made in the temperature interval between 6 and 140 K. It is shown that the narrow impurity emission line at 3.36 eV is sensitive to phase-transition points including the superconducting phase onset. Impurity emission spectra may serve as local optical probes for detecting electron and lattice changes in high-temperature superconductors.
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