On the influence of anharmonicity on the isotope effect

✍ Scribed by T. Galbaatar; S.L. Drechsler; N.M. Plakida; G.M. Vujicic

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 179 KB
• Volume: 185-189
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)90891-2

✦ Synopsis

The effect of double-well type lattice anharmonicity on the superconducting temperature and its isotope effect is investigated beyond the two-level approximation (TLA) within the Eliashberg theory. It is shown that anharmonicity can greatly modify the isotope effect; In particular anomalously large as well as negative values of the isotope effect exponent ~ are obtained in the strong and weak coupling limits, respectively.