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Phase transitions and structural instability in HTSC compounds and related phases

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SG Titova, VF Balakirev, PP PalVal, LN PalVal, JTS Irvine

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Lattice dimensions anomalies are investigated for different HTSC compounds (123- and 124-YBCO, 2201-,2212- and 2223-BSCCO, 2223-TBCCO; LSCO, NCCO) and related phases (Y2BaCuO5 CuO) by acousic and X-ray powder diffraction measurements in temperature range T-c - 300 K. Two kinds of anomalies have been established for superconducting compounds only at T-0 similar to T-c + 15 K and T-1 similar to 190-270 K, with each having a quite different nature. It is shown that T-0 increases and T-1 decreases as critical temperature increases. The values of T-0 and T-1 as functions of the distance between CuO2- planes are obtained. Localization processes in the charge carrier subsystem are suggested to be assotiated with the T-1 anomaly.



Original languageEnglish
Pages (from-to)1417-1418
Number of pages2
JournalCzechoslovak Journal of Physics
Publication statusPublished - 1996
Event21st International Conference on Low Temperature Physics (LT 21) - PRAGUE, Czech Republic
Duration: 8 Aug 199614 Aug 1996

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