Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Spin Textures and magnetic Phase Transitions
MA 5.13: Vortrag
Montag, 7. März 2016, 13:15–13:30, H34
Study of the Magnetic Excitations in the Dimer Compound Ba3-xSrxCr2O8 — •Alsu Gazizulina1, Henrik Grundmann1, Diana Quintero Castro2, and Andreas Schilling1 — 1Physik-Institut of University of Zurich, Zurich, Switzerland — 2Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany
Spin dimer systems, such as Ba3Cr2O8 and Sr3Cr2O8 show a field induced phase transition that can be described in terms of a Bose-Einstein condensation (BEC) of magnetic quasiparticles (triplons) in connection with the collective dimer states. The respective critical fields of Ba3Cr2O8 and Sr3Cr2O8 differ strongly due to a large difference in the strength of the intradimer magnetic interaction constant J0. For the corresponding solid solution Ba3-xSrxCr2O8, the strength of this interaction constant has been reported to be tunable in a non-linear way in a wide range by changing the Sr content x. Recently, we were able to grow single crystal samples of Ba0.1Sr2.9Cr2O8 and Ba0.2Sr2.8Cr2O8. . Our initial results for Ba0.1Sr2.9Cr2O8 point out to an intradimer exchange coupling J0 to be 5.18 meV, smaller than the value for the pure compound Sr3Cr2O8 of 5.55 meV.