SPIN FLUCTUATIONS BEYOND THE GUTZWILLER APPROXIMATION - A RENORMALIZED PARAMAGNON THEORY

被引：1

作者：

RAIMONDI, R

LAVAGNA, M

机构：

[1] Centre d'Etudes Nucléaires de Grenoble, DRFMC-SPSMS, Grenoble Cedex 9, 38054

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 1995年 / 99卷 / 3-4期

关键词：

D O I：

10.1007/BF00752308

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We analyze the spin fluctuations in the single-band lattice Hubbard model by using the slave-boson technique. It is shown that, at the Gaussian level beyond the saddle-point approximation, spin fluctuations obey a simple RPA-like form at all frequencies and wavevectors. Spin fluctuations, then, appear to give rise to an effective renormalized paramagnon theory opening new perspectives for the discussion of the effect of a magnetic field on Mott-Hubbard systems.

引用

页码：355 / 357

页数：3

共 7 条

[1] FIELD DEPENDENCES OF MAGNETIZATION AND SPECIFIC-HEAT COEFFICIENT IN A NEARLY MAGNETIC SYSTEM - LIQUID-HE-3 AND STRONG PAULI PARAMAGNETS [J].