Stress-Induced Domain Wall Motion in a Ferroelastic Mn3+ Spin Crossover Complex

Vibe B Jakobsen; Elzbieta Trzop; Laurence C Gavin; Emiel Dobbelaar; Shalinee Chikara; Xiaxin Ding; Kane Esien; Helge Müller-Bunz; Solveig Felton; Vivien S Zapf; Eric Collet; Michael A Carpenter; Grace G Morgan

doi:10.1002/anie.202003041

Stress-Induced Domain Wall Motion in a Ferroelastic Mn³⁺ Spin Crossover Complex

Angew Chem Int Ed Engl. 2020 Aug 3;59(32):13305-13312. doi: 10.1002/anie.202003041. Epub 2020 Jun 8.

Authors

Vibe B Jakobsen¹, Elzbieta Trzop², Laurence C Gavin¹, Emiel Dobbelaar^{1

3}, Shalinee Chikara^{4

5}, Xiaxin Ding^{6

7}, Kane Esien⁸, Helge Müller-Bunz¹, Solveig Felton⁸, Vivien S Zapf⁶, Eric Collet², Michael A Carpenter⁹, Grace G Morgan¹

Affiliations

¹ School of Chemistry, University College Dublin, Belfield, Dublin, 4, Ireland.
² Univ Rennes, CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, 35000, Rennes, France.
³ Current address: Technische Universität Kaiserslautern, Kaiserslautern, Germany.
⁴ Department of Physics, Auburn University, Auburn, AL, 36849, USA.
⁵ Current address: National High Magnetic Field Lab at Florida State University, Tallahassee, FL, USA.
⁶ National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.
⁷ Current address: Idaho National Laboratory, Idaho Falls, ID, USA.
⁸ Centre for Nanostructured Media, School of Mathematics and Physics, Queen's University of Belfast, Belfast, BT7 1NN, Northern Ireland, UK.
⁹ Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK.

Abstract

Domain wall motion is detected for the first time during the transition to a ferroelastic and spin state ordered phase of a spin crossover complex. Single-crystal X-ray diffraction and resonant ultrasound spectroscopy (RUS) revealed two distinct symmetry-breaking phase transitions in the mononuclear Mn³⁺ compound [Mn(3,5-diBr-sal₂ (323))]BPh₄ , 1. The first at 250 K, involves the space group change Cc→Pc and is thermodynamically continuous, while the second, Pc→P1 at 85 K, is discontinuous and related to spin crossover and spin state ordering. Stress-induced domain wall mobility was interpreted on the basis of a steep increase in acoustic loss immediately below the the Pc-P1 transition.

Keywords: domain wall; ferroelastic materials; manganese(III); spin crossover; structural phase transition.

Abstract

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