Charge Order inNaV2O5Studied by EPR

Abstract
We present angular dependent EPR measurements in NaV2O5 at X-band frequencies in the temperature range 4.2T670 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 T100 K, is followed by zigzag charge-order fluctuations which become long range and static below TSP=34 K.

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