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Microscopic model for the isotope effect in the high-Tc oxides

V. Z. Kresin and S. A. Wolf
Phys. Rev. B 49, 3652(R) – Published 1 February 1994
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Abstract

An unconventional microscopic mechanism relating Tc and the isotope substitution for the doped superconductors such as the high-Tc oxides is proposed. Strong nonadiabaticity, when it is impossible, strictly speaking, to separate fully the nuclear and electronic degrees of freedom, leads to a peculiar dependence of the carrier concentration n on the ionic mass M. This case corresponds, for example, to the isotopic substitution of the axial oxygen in YBa2Cu3O7x. Because of the dependence of Tc on n, this leads to the dependence of Tc on M, that is to the isotope effect. The minimum value of the isotope coefficient corresponds to Tc=Tcmax.

  • Received 10 August 1993

DOI:https://doi.org/10.1103/PhysRevB.49.3652

©1994 American Physical Society

Authors & Affiliations

V. Z. Kresin

  • Lawrence Berkeley Laboratory, Berkeley, California 94720

S. A. Wolf

  • Naval Research Laboratory, Washington, D.C. 20375-5343

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Vol. 49, Iss. 5 — 1 February 1994

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