# Tuning the orbital-lattice fluctuations in the mixed spin-dimer system $Ba_{3−x}Sr_xCr_2O_8$

Gazizulina, Alsu; Quintero-Castro, Diana Lucia; Wulferding, Dirk; Teyssier, Jeremie; Prokes, Karel; Yokaichiya, Fabiano; Schilling, Andreas (2018). Tuning the orbital-lattice fluctuations in the mixed spin-dimer system $Ba_{3−x}Sr_xCr_2O_8$. Physical review. B, 98(14):144115.

## Abstract

Abstract: In A3Cr2O8, where A = Sr or Ba, the Cr5+ ions surrounded by oxygen ions in a tetrahedral coordination are Jahn-Teller active. The Jahn-Teller distortion leads to a structural transition and a related emergence of three twinned monoclinic domains below the structural phase transition. This transition is highly dynamic over an extended temperature range for A = Sr. We have investigated mixed compounds Ba3−xSrxCr2O8 with x=2.9 and x=2.8 by means of X-ray and neutron diffraction, Raman scattering and calorimetry. Based on the obtained evolution of the phonon frequencies, we find a distinct suppression of the orbital-lattice fluctuation regime with increasing Ba content. This stands in contrast to the linear behaviour exhibited by unit cell volumes, atomic positions and intradimer spin-spin exchange interactions

## Abstract

Abstract: In A3Cr2O8, where A = Sr or Ba, the Cr5+ ions surrounded by oxygen ions in a tetrahedral coordination are Jahn-Teller active. The Jahn-Teller distortion leads to a structural transition and a related emergence of three twinned monoclinic domains below the structural phase transition. This transition is highly dynamic over an extended temperature range for A = Sr. We have investigated mixed compounds Ba3−xSrxCr2O8 with x=2.9 and x=2.8 by means of X-ray and neutron diffraction, Raman scattering and calorimetry. Based on the obtained evolution of the phonon frequencies, we find a distinct suppression of the orbital-lattice fluctuation regime with increasing Ba content. This stands in contrast to the linear behaviour exhibited by unit cell volumes, atomic positions and intradimer spin-spin exchange interactions

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