Jahn-Teller coupled charge density wave in a double exchange system

被引：2
作者：
Mitra, Manidipa [1 ]
机构：
[1] SN Bose Natl Ctr Basic Sci, Kolkata 700098, India
来源：
PHYSICA B-CONDENSED MATTER | 2007年 / 400卷 / 1-2期
关键词：
electron lattice interaction; Jahn-Teller distortions; charge density wave;
D O I：
10.1016/j.physb.2007.06.018
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
In a two orbital model, we formulate Jahn-Teller coupled charge density wave in one electron per lattice site limit. Softening of Jahn-Teller phonons corresponding to distortion modes Q2 or Q3 associated with perfect nesting of Fermi surface leads to this instability at low temperature. The gap equation for charge density wave state and its dependences on electron-lattice coupling are calculated explicitly when any one of the Jahn-Teller modes is excited cooperatively. We find that the Q2 distortion mode yields lowest free energy. Effect of electron-lattice interaction on collective mode, such as amplitude mode, is more pronounced when the excited mode is Q2. © 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：59 / 65
页数：7
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