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Rearrangement of emission spectra of the oxygen subsystem in Y–Ba–Cu near the superconducting transition

I. Ya. Fugol’Physicotechnical 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 , KharkovYu. I. RybalkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovV. M. ZhuravlevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , Kharkov

Soviet Journal of Low Temperature Physicsjournal1988en

ABI

Annotatsiya

Luminescence investigations of the temperature behavior of Y–Ba–Cu superconducting samples excited by an electron beam are carried out. Narrow-band peaks at 3.3 eV and wide-band maxima near 3.1 and 2.5 eV associated with oxygen–copper subsystem are singled out in the emission spectrum. It is found that at the superconducting transition point Tc, the rearrangement of the emission spectrum takes place: the narrow-band peaks are abruptly suppressed, the intensity in the 2.6 eV band is enhanced, and atomic lines of neutral oxygen emerge (atomic oxygen is expelled from the sample). The observed changes in the electron spectrum of Y–Ba–Cu together with hysteresis effects in the temperature dependence of radiation confirm the energy and structure arrangement of the oxygen subsystem at Tc, which is a phase transition of the second kind close to the first.

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Mavzular

Physics of Superconductivity and Magnetism Superconducting Materials and Applications Rare-earth and actinide compounds

Identifikatorlar

DOI: 10.1063/10.0032044

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