Electron-phonon and spin-phonon coupling in NaV2O5:: Charge fluctuations effects

被引：31
|
作者：
Sherman, EY [1 ]
Fischer, M
Lemmens, P
van Loosdrecht, PHM
Güntherodt, G
机构：
[1] Rhein Westfal TH Aachen, Inst Phys 2, D-52056 Aachen, Germany
[2] Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Region, Russia
来源：
EUROPHYSICS LETTERS | 1999年 / 48卷 / 06期
关键词：
D O I：
10.1209/epl/i1999-00533-6
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We show that the asymmetric crystal environment, of the V site in the ladder compound NaV2O5 leads to a strong coupling of vanadium 3d electrons to phonons. This coupling causes fluctuations of the charge on the V ions, and favors a transition to a charge-ordered state at low temperatures. In the low temperature pha se the charge fluctuations modulate the spin-spin superexchange interaction, resulting in a strong spin-phonon coupling.
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页码：648 / 654
页数：7
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