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Based on analytical and numerical approaches, we investigate thermodynamicproperties of CuSe2O5 at high magnetic fields which is a candidate for thestrong intra-chain interaction in quasi one-dimensional (1D) quantum magnets.Magnetic behavior of the system can be described by the 1D spin-1/2 XXZ modelin the presence of the Dzyaloshinskii-Moriya (DM) interaction. Un- der thesecircumstances, there is one quantum critical field in this compound. Below thequantum critical field the spin chain system is in the gapless Luttinger liquid(LL) regime, whereas above it one observes a crossover to the gapped saturationmagnetic phase. Indications on the thermodynamic curves confirm the occurrenceof such a phase transition. The main characteristics of the LL phase aregapless and spin-spin correlation functions decay algebraic. The effects ofzero-temperature quantum phase transition are observed even at rather hightemperatures in comparison with the counterpart compounds. In addition, wecalculate the Wilson ratio in the model. The Wilson ratio at a fixedtemperature remains almost independent of the field in the LL region. In thevicinity of the quantum critical field, the Wilson ratio increases and exhibitsanomalous enhancement.

Theoretical investigation of the behavior of CuSe2O5 compound in high magnetic fields