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Prog. Theor. Phys. Vol. 83 No. 3 (1990) pp. 455-466

The Influence of the Singularity-Enhanced Density of States on the Isotope Effect in a Bond Asymmetric Model for a Cu-O Based High-T_c Superconductor

Seiichi Seki and Kosai Tanabe

Department of Physics, Saitama University, Urawa 338

(Received September 18, 1989)

Abstract:

In a Cu-O based high-T_c superconductor, we investigate possible singularities in the density of states of a bond asymmetric model with intralayer hoppings between nearest and next nearest neighbor O-sites and exrtremely smal interlayer hopping. A combination of such hoppings and the bond asymmetry leads to various types of singularities. By considering the Debye cutoff dependence of T_c, we point out that the singularity-enhanced density of states induces an interesting chemical potential dependence of the isotope effect.

URL : http://ptp.ipap.jp/link?PTP/83/455/
DOI : 10.1143/PTP.83.455

[ Full Text PDF : FREE ACCESS (608K) ] Citation: Plain Text BiBTeX EndNote(RIS) RSS

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Citing Article(s) :

1. Journal of the Physical Society of Japan 59 (1990) pp. 3307-3321 :

   The Constrained Hartree-Fock-Bogoliubov Approximation at Finite Temperature for Superconductors -Proposal of the Formalism and Its Numerical Method-

   Kosai Tanabe and Mitsuru Ogoshi

2. Journal of the Physical Society of Japan 60 (1991) pp. 1306-1320 :

   Superconductivity near Charge Transfer Instability in CuO₂ Structure

   Akiharu Miyanaga, Yasumasa Hasegawa and Hidetoshi Fukuyama

3. Journal of the Physical Society of Japan 60 (1991) pp. 2748-2760 :

   Self-Consistent Solution of the Bond-Asymmetric Two-BandModel for a Cu-O Based High-T_c Superconductor

   Kosai Tanabe and Masako Kuramoto

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