Charge order in NaV2O5 studied by EPR
We present angular dependent EPR measurements in NaV2O5 at X-band frequencies in the temperature range 4.2</=T</=670 K. A detailed analysis in terms of the antisymmetric Dzyaloshinski-Moriya and the anisotropic exchange interactions yields the following scheme of charge order: On decreasing temperature a quarter-filled ladder with strong charge disproportions, existing for T>/=100 K, is followed by zigzag charge-order fluctuations which become long range and static below T(SP) = 34 K.
Lohmann
M
Experimentalphysik V, EKM, Institut fur Physik, Universitat Augsburg, D-86135 Augsburg, Germany.
Krug Von Nidda H
Eremin
MV
Loidl
A
Obermeier
G
Horn
S