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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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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:31 October 2018
Deposited On:20 Dec 2018 12:42
Last Modified:24 Sep 2019 23:57
Publisher:American Physical Society
ISSN:2469-9950
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevb.98.144115

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