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$BaCuSi_2O_6$ is a quasi-two dimensional spin dimer system and a modelmaterial for studying Bose-Einstein condensation (BEC) of magnons in highmagnetic fields. The new $Ba_{1-x}Sr_xCuSi_2O_6$ mixed system, which can begrown with x < 0.3, and $BaCuSi_2O_6$, both grown by using a crystal growthmethod with enhanced oxygen partial pressure, have the same tetragonalstructure ($I4_1/acd$) at room temperature. The mixed system shows nostructural phase transition, so that the tetragonal structure is stable down tolow temperatures. The oxygen partial pressure acts as control parameter for thegrowth process. A detailed understanding of the crystal structure depending onthe oxygen content will enable the study of the spin dynamics of field-inducedorder states in this model magnetic compound of high current interest with onlyone type of dimer layers, which shows the same distance between the Cu atoms,in the structure.

Crystal growth with oxygen partial pressure of the $BaCuSi_2O_6$ and $Ba_{1-x}Sr_xCuSi_2O_6$ spin dimer compounds