Spinwaves and large electron-phonon coupling near the metal-insulator transition in hole-doped high-T_C oxides

2001/02/20 by T. Jarlborg, Jarlborg, T.
Materials Science · Physics and Astronomy · #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.mtrl-sci #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.cond-mat/0102343

(3 figures)

arxiv created 2001/02/20 · arxiv updated 2009/11/30

Abstract

A theory for spin and lattice couplings to the electronic states in high-T_C oxides is presented, with HgBa₂CuO₄ as an example. A simple analytical model suggests that the barrel band is sensitive to potential perturbations with long-range Fourier components, and that gaps can be opened at the Fermi energy. This is confirmed in self-consistent band calculations for modulations in elongated supercells, where spin waves and phonon coupling compete for equal q-vectors. It is argued that the wavelengths of spin-wave modulations and of the phonon modes with large coupling, depend on the doping. This mechanism supports the idea that pseudogaps are caused by stripe like spin-modulations in underdoped systems, while superconductivity is attributed to enhanced electron-phonon coupling for long wavelength phonons.

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