Low-temperature phase transition in superconducting ceramics YBa2CU3O7
V. V. EremenkoPhysicotechnical 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 , KharkovV. N. SamovarovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovV. M. ShuravlevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , Kharkov
ABI
Annotatsiya
Temperature dependences of narrow-band cathode luminescence intensity of superconducting (SC) ceramics YBa2Cu3O7 exhibit a wide asymmetric hysteresis in the region from Tl = 30 K to Tc = 98 K. The hysteresis appears only when the sample is is cooled to below Tl = 30 K. The temperature variation rate influences the lower and upper hysteresis branches in different ways. The results are explained in terms of the concept of the first-order phase transition (PT) between two SC phases. The assumption is made concerning the kinetic blocking of a metastable phase nucleus in the range from 30 to 98 K and the stability loss in the high-temperature SC phase at 30 K.
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