La₂CuO₄正交相中低频自旋动力学
超导电性
2009-10-31 v1
摘要
推导了一个有效场论，用于描述La₂CuO₄在低温正交相中低频自旋动力学。限于单个CuO₂层，该有效理论是相对论非线性Sigma模型的一个简单推广，包含所有由对称性允许的自旋相互作用。 incorporating a weak interlayer interaction leads to two coupled nonlinear sigma models which provide an efficient description of the complete bilayer dynamics. Particular attention is paid to the weak-ferromagnetic and spin-flop transitions induced by external magnetic fields. The main features of the observed (covert) weak ferromagnetism are thus accounted for in a straightforward manner but some of the finer theoretical predictions would require further experimental investigation. The derived framework is also suitable for the study of the structure and dynamics of magnetic domains in undoped La₂CuO₄.
引用
@article{arxiv.cond-mat/0004071,
title = {Low-frequency spin dynamics in the orthorombic phase of La_2CuO_4},
author = {J. Chovan and N. Papanicolaou},
journal= {arXiv preprint arXiv:cond-mat/0004071},
year = {2009}
}
备注
15 pages, 8 figures