Tuning the critical magnetic field of the triplon Bose–Einstein condensation in $Ba_{3-x}Sr_xCr_2O_8$

Grundmann, Henrik; Sabitova, Alsu; Schilling, Andreas; Rohr, Fabian von; Förster, Tobias; Peters, Laurens (2016). Tuning the critical magnetic field of the triplon Bose–Einstein condensation in $Ba_{3-x}Sr_xCr_2O_8$. New Journal of Physics, 18(3):033001.

Abstract

The structure and magnetic interactions of the triplon Bose-Einstein condensation candidates $Ba_3Cr_2O_8$ and $Sr_3Cr_2O_8$ have been studied thoroughly in the literature, but little is known about a possible triplon condensation in the corresponding solid solution$Ba_{3-x}Sr_xCr_2O_8$. We have prepared various members of this solid solution and systematically examined their magnetic properties in high magnetic fields up to 60 T and at low temperatures down to 340 mK, by means of pulsed field and cantilever magnetometry. From these experiments for x $\in$ {3,2.9,2.8,2.7,2.6,2.5}, we find that the critical fields of $Ba_{3-x}Sr_xCr_2O_8$ decrease monotonically with decreasing Sr content x. This change is in good agreement with the earlier reported variation of the magnetic interactions in these compounds.

Abstract

The structure and magnetic interactions of the triplon Bose-Einstein condensation candidates $Ba_3Cr_2O_8$ and $Sr_3Cr_2O_8$ have been studied thoroughly in the literature, but little is known about a possible triplon condensation in the corresponding solid solution$Ba_{3-x}Sr_xCr_2O_8$. We have prepared various members of this solid solution and systematically examined their magnetic properties in high magnetic fields up to 60 T and at low temperatures down to 340 mK, by means of pulsed field and cantilever magnetometry. From these experiments for x $\in$ {3,2.9,2.8,2.7,2.6,2.5}, we find that the critical fields of $Ba_{3-x}Sr_xCr_2O_8$ decrease monotonically with decreasing Sr content x. This change is in good agreement with the earlier reported variation of the magnetic interactions in these compounds.