Pressure-controlled oxygen order and superconductivity in REBaCuO (RE=Y,Nd) near the metal–insulator transition

Disappearance of superconductivity correlated with an increase of the unit cell volume, V cell, as a result of the oxygen disordering process caused by the pressure release was observed for NdBa 2Cu 3O 6.67 in both magnetic and X-ray measurements. Correlation between changes of T c and V cell under...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1999-05, Vol.317, p.532-535
Main Authors: Fita, I.M., Dyakonov, V.P., Kamenev, V.I., Puzniak, R., Szymczak, H.
Format: Article
Language:English
Subjects:
Charge transfer
Oxygen ordering
Pressure effect
REBaCuO compounds
Superconductivity appearance
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Summary:Disappearance of superconductivity correlated with an increase of the unit cell volume, V cell, as a result of the oxygen disordering process caused by the pressure release was observed for NdBa 2Cu 3O 6.67 in both magnetic and X-ray measurements. Correlation between changes of T c and V cell under pressure is well described by a simple model based on the O(5)→O(1) transition in the CuO x planes. It was found that due to the oxygen ordering the compressibility of NdBa 2Cu 3O 6.67 increases with time by 30%. Superconductivity occurs at pressure p c=0.21 GPa. The T c( p) dependence is a nonlinear function of an applied pressure. The d T c/d p reaches value of 80 K/GPa near p c. Time asymmetry in the processes of oxygen ordering and disordering for both NdBa 2Cu 3O 6.67 and YBa 2Cu 3O 6.38 was found.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(99)00118-5