MODEL FOR AN EXTRA PHONON MODE IN LA2CUO4 AND LA2NIO4

被引：5

作者：

ALLEN, PB ^{[1
]}

机构：

[1] SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794

来源：

PHYSICAL REVIEW B | 1991年 / 43卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.43.2766

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Phonon dispersion curves for two-dimensional analogs of La2CuO4 and La2NiO4 are modeled by adding a scalar degree of freedom to mimic a low-lying charge-fluctuation mode. The resulting model bears a close resemblance to the "extra phonon mode" seen in neutron scattering by Pintschovius et al. In particular, the mode is invisible to neutrons at Q = 0 because scalar symmetry prevents admixture with vibrational modes at Q = 0. Possible interpretations of this new mode are suggested.

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页码：2766 / 2770

页数：5

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