ANHARMONICITY-INDUCED MULTIPHONON PROCESSES IN HIGH-TEMPERATURE SUPERCONDUCTORS

被引：57

作者：

BUSSMANNHOLDER, A

BISHOP, AR

机构：

[1] UNIV BAYREUTH, W-8580 BAYREUTH, GERMANY

[2] UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA

来源：

PHYSICAL REVIEW B | 1991年 / 44卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.44.2853

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electron-two-phonon interactions are considered on the basis of an extended BCS-type Hamiltonian. An equation for the superconducting transition temperature T(c) and the energy gap 2-DELTA-0 is derived in the weak-coupling limit. Instead of a Debye frequency a reduced optic-acoustic mode frequency, together with a coupled effective electron-phonon interaction, determines the magnitude of T(c). This leads to a distinctly different isotope effect from BCS, which is compared with data on La(2-x)Sr(x)CuO4. The energy gap is predicted to be anisotropic and 2-DELTA-0/kT(c) to be compound dependent.

引用

页码：2853 / 2856

页数：4

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