P.H. Kes, C.C. Tsuei
Physical Review B
High-Tc Cu oxides such as YBa2Cu3O7 and the Bi-Sr-Ca-Cu-O systems are characterized by a near-zero oxygen-isotope effect. Recent results by Crawford et al. show, however, that the isotope effect in the La2-xSrxCuO4 system depends strongly on the doping level (x) and can significantly exceed the BCS limit. Within the framework of the BCS phonon-mediated pairing, a logarithmic (2D) Van Hove singularity in the density of states can provide a basis for understanding these anomalous isotope effects and possibly the origin of high-temperature superconductivity. © 1990 The American Physical Society.
P.H. Kes, C.C. Tsuei
Physical Review B
D.M. Newns, C.C. Tsuei, et al.
Physical Review Letters
C.C. Tsuei, J.R. Kirtley, et al.
Chinese Journal of Physics
C.C. Tsuei, J.R. Kirtley
Reviews of Modern Physics