Electron-phonon and spin-phonon coupling in NaV<sub>2</sub>O<sub>5</sub>: Charge fluctuations effects
E. Ya. Sherman; M. Fischer; P. Lemmens; P. H. M. van Loosdrecht; G. Güntherodt; E. Ya. Sherman; II. Physikalisches Institut, RWTH-Aachen - 52056 Aachen, Germany; M. Fischer; II. Physikalisches Institut, RWTH-Aachen - 52056 Aachen, Germany; P. Lemmens; II. Physikalisches Institut, RWTH-Aachen - 52056 Aachen, Germany; P. H. M. van Loosdrecht; II. Physikalisches Institut, RWTH-Aachen - 52056 Aachen, Germany; G. Güntherodt; II. Physikalisches Institut, RWTH-Aachen - 52056 Aachen, Germany
Журнал:
EPL (Europhysics Letters)
Дата:
1999-12-15
Аннотация:
We show that the asymmetric crystal environment of the V site in the ladder compound NaV<sub>2</sub>O<sub>5</sub> 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.
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