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The specific heat, magnetic susceptibility and ESR signals of a Na-deficientvanadate Na_xV_2O_5 (x=1.00 - 0.90) were studied in the temperature range 0.07- 10 K, well below the transition point to a spin-gap state. The contributionof defects provided by sodium vacancies to the specific heat was observed. Ithas a low temperature part which does not tend to zero till at least 0.3 K anda high temperature power-like tail appears above 2 K. Such dependence maycorrespond to the existence of local modes and correlations between defects inV-O layers. The magnetic measurements and ESR data reveal S=1/2 degrees offreedom for the defects, with their effective number increasing in temperatureand under magnetic field. The latter results in the nonsaturating magnetizationat low temperature. No long-range magnetic ordering in the system of defectswas found. A model for the defects based on electron jumps near vacancies isproposed to explain the observed effects. The concept of a frustratedtwo-dimensional correlated magnet induced by the defects is considered to beresponsible for the absence of magnetic ordering.Comment: 6 pages, 8 figure

physical review. b, condensed matter

Thermal and magnetic properties of defects in the spin-gap compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">NaV</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Thermal and magnetic properties of defects in the spin-gap compoundNaV2O5