Exploring the effects of pressure on the magnetic properties of quasi-low dimensional quantum magnets via thermodynamic measurements

Abstract: Four model solid state compounds were used to experimentally investigate the effects of pressure on the interactions in one- and two-dimensional Heisenberg magnetic models. BaCuSi2O6, BaCu2V2O8, SrCuO2 and CuGeO3 were successfully synthesized via solid-state reactions and characterized via x-ray diffraction. BaCu2V2O8 was additionally characterized via spectroscopic techniques to confirm the oxidation state of the material. The powder magnetic susceptibility of BaCuSi2O6 was successfully measured and analyzed both at ambient conditions and under applied pressures. The extracted values of Jintra ∼ 4.4 meV and Jinter ∼ 0.75 meV at ambient pressure were found to be in good agreement with previously published data. We found that applying pressure significantly increases the interdimer interaction while the dominant intradimer interaction is only slightly affected by applying pressure. The single crystal magnetic susceptibility of BaCu2V2O8 was successfully measured and analyzed in ambient conditions. The extracted values of the strong intradimer interaction Jintra = 39.39 meV and the weaker interdimer interaction J′inter = −15 meV were found to be in good and reasonable agreement respectively with published results. Measurements of single crystal magnetic susceptibility of BaCu2V2O8 under applied pressure have been done but analysis require additional background measurements of the pressure cell.