Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Magnetic Heuslers, Half-Metals, Semiconductors, and Oxides (organized by MA)

TT 23.11: Vortrag

Montag, 16. März 2015, 17:45–18:00, H 1012

Structure and magnetic interactions in Ba3-xSrxCr2O8 — •Alsu Gazizulina, Henrik Grundmann, and Andreas Schilling — Physik-Institut of University of Zurich, Zurich, Switzerland

The spin dimer systems Ba3Cr2O8 and Sr3Cr2O8 are two candidates for the Bose Einstein condensation (BEC) of magnetic quasiparticles (triplons). We have recently reported on a peculiar non-linear tuning of the magnetic interaction constant J0 in the corresponding solid solution Ba3-xSrxCr2O8 by varying the Sr content x. By performing theoretical calculations based on the crystal structure, we could well reproduce the observed variation in J0. As the critical field Hc of the triplon BEC strongly depends on the magnetic interactions in the system, we have also probed the dependency of this critical field on x. Here, we report on the observed relationship between J0(x) and Hc(x) in Ba3-xSrxCr2O8.