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• W2018834263 abstract "We have measured the superconducting transition temperature Tcof oxygen deficient single crystals of YBa2Cu3Ox, where x = 7−δ in the range 6.5<x<6.9, after the crystals were subjected to a series of quenching and aging experiments. A change in the nature of the equilibrium state was observed at temperatures above a concentration dependent threshold temperature T∗. We associate T∗ with the onset of a transition from a vacancy ordered low temperature (ortho II and/or ortho III) phase to a high temperature ortho I phase. The nature of the vacancy ordering below T∗ varies with x. We believe that, upon heating above T∗, a signigicant concentration of chain fragments develops in normally vacant chains of the ordered structure. When the crystals were quenched from temperatures above T∗, and subsequently permitted to anneal at 51°C, two relaxation processes were found. The two processes have relaxation times differing by about two orders of magnitude. The faster relaxation process is associated with changes in vacancy short-range disorder. The slower process is attributed to restoration of long-range chain vacancy order as misplaced fragments anneal out. T∗ is determined for different oxygen concentrations and compared to theoretical phase diagram calculations. Electron diffraction measurements on well annealed single crystals with stoichiometries x = 6.50 and 6.65 show that different chain ordered phases (primarily ortho II and ortho III, respectively) exist at each of these compositions. Chain vacancy order is also observed at temperatures above T∗." @default.
• W2018834263 created "2016-06-24" @default.
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• W2018834263 date "1992-04-01" @default.
• W2018834263 modified "2023-10-16" @default.
• W2018834263 title "New observation of a phase boundary in oxygen deficient YBa2Cu3O7−δ single crystals" @default.
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• W2018834263 doi "https://doi.org/10.1016/0921-4534(92)90725-r" @default.
• W2018834263 hasPublicationYear "1992" @default.
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