Different path of pressure-induced oxygen ordering and disordering processes in YBa2Cu3O6+x
near a metal-insulator transition |
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| Authors: | I M Fita V P D’yakonov R Puznyak G Szymczak |
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| Institution: | (1) Donetsk Physicotechnical Institute, Ukrainian Academy of Sciences, 340114 Donetsk, Ukraine;(2) Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland |
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| Abstract: | The relaxation of the superconducting transition temperature T
c in YBa2Cu3O6.38 is investigated with increasing oxygen order in the CuOx plane under 1 GPa pressure and with decreasing oxygen order after the pressure is relieved. It is established that the oxygen
disordering process is more rapid than the pressure-induced ordering process: The ratio of the relaxation times of T
c in these processes τ
ord/τ
disord≈5. This behavior could be caused by different mechanisms of the pressure-induced increase in the Cu-O chain length and decrease
of this length after pressure relief.
Fiz. Tverd. Tela (St. Petersburg) 40, 1968–1973 (November 1998) |
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