Volume 48, Number 6, December 1999
|Page(s)||648 - 654|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Electron-phonon and spin-phonon coupling in NaV2O5: Charge fluctuations effects
II. Physikalisches Institut, RWTH-Aachen - 52056 Aachen, Germany
Accepted: 15 October 1999
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 phase the charge fluctuations modulate the spin-spin superexchange interaction, resulting in a strong spin-phonon coupling.
PACS: 63.20.Kr – Phonon-electron and phonon-phonon interactions / 75.30.Et – Exchange and superexchange interactions / 78.30.-j – Infrared and Raman spectra
© EDP Sciences, 1999
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