Time-dependent superconducting behavior of oxygen-deficient <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">YBa</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Cu</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mi mathvariant="italic">x</mi></mrow></msub></mrow></math>: Possible annealing of oxygen vacancies at 300 K

B. W. Veal; H. You; A. P. Paulikas; H. Shi; Y. Fang; J. W. Downey

doi:10.1103/PhysRevB.42.4770

Time-dependent superconducting behavior of oxygen-deficient ${YBa}_{2}$ ${Cu}_{3}$ $O_{x}$ : Possible annealing of oxygen vacancies at 300 K

B. W. Veal, H. You, A. P. Paulikas, H. Shi, Y. Fang, and J. W. Downey

Phys. Rev. B 42, 4770 – Published 1 September 1990

Abstract

Oxygen stoichiometries in single crystals of ${YBa}_{2}$ ${Cu}_{3}$ $O_{x}$ are controlled by quenching from an $O_{2}$ - $N_{2}$ atmosphere at 520 °C to liquid nitrogen. After quenching, the superconducting behavior and lattice parameters are found to be time dependent. $T_{c}$ increases as much as 15 K in a period of several days. Apparently, annealing, with increasing oxygen vacancy order, occurs at room temperature.

Received 15 May 1990

DOI:https://doi.org/10.1103/PhysRevB.42.4770

Authors & Affiliations

B. W. Veal, H. You, A. P. Paulikas, H. Shi, Y. Fang, and J. W. Downey

Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439

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Vol. 42, Iss. 7 — 1 September 1990

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