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We report the results of low-temperature measurements of the specific heatCp(T), ac susceptibility chi(T) and 23Na nuclear magnetic resonance NMR ofNa2V3O7. At liquid He temperatures Cp(T)/T exhibits broad field-dependentmaxima, which shift to higher temperatures upon increasing the applied magneticfield H. Below 1.5 K the ac magnetic susceptibility chi(T) follows aCurie-Weiss law and exhibits a cusp at 0.086 mK which indicates a phasetransition at very low temperatures. These results support the previousconjecture that Na2V3O7 is close to a quantum critical point (QCP) at mu_{0}H =0 T. The entire data set, including results of measurements of the NMRspin-lattice relaxation 1/T1(T), reveals a complex magnetic behavior at lowtemperatures. We argue that it is due to a distribution of singlet-tripletenergy gaps of dimerized V moments. The dimerization process evolves over arather broad temperature range around and below 100 K. At the lowesttemperatures the magnetic properties are dominated by the response of only aminor fraction of the V moments.

physical review. b, condensed matter and materials physics

Unusual magnetic properties of the low-dimensional quantum magnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Na</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">V</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>

Unusual magnetic properties of the low-dimensional quantum magnetNa2V3O7