Magnetic Excitation of t–J Model with Quasi-One-Dimensional Fermi Surface — Possible Relevance to LSCO Systems

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概要

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• On the basis of the picture of a quasi-one-dimensional (q-1d) Fermi surface (FS), recently proposed by authors for LSCO systems, spin excitation spectrum, $\textIm \chi(\mbi{q},\omega)$, is calculated in the `RPA' within the slave-boson mean-field approximation to the t–J model. It is found that $\textIm\chi(\mbi{q},\omega)$ shows both incommensurate (IC) and diagonal IC (DIC) peaks, whose realization does not depend on the existence of the d-wave gap. The peak positions do not change appreciably with ω and the sharp peaks survive down to the low hole doping rate. The d-wave gap suppresses both the IC peak and the DIC peak, but the degree of suppression as a function of ω is different between them. Taking these results together with results for the two-dimensional FS, we argue that essential features of magnetic excitation in LSCO systems can be understood in terms of the q-1d picture of the FS.

• Physical Society of Japanの論文
• 2001-09-15

著者

• Kohno Hiroshi

  Graduate School Of Engineering Science Osaka University

• Yamase Hiroyuki

  Institute For Solid State Physics University Of Tokyo

• Kohno Hiroshi

  Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531

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• Magnetic Excitation of t–J Model with Quasi-One-Dimensional Fermi Surface — Possible Relevance to LSCO Systems

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