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Thermal and Magnetic Field Switching in a Two‐Step Hysteretic Mn(III) Spin Crossover Compound Coupled to Symmetry Breakings

Abstract : A Mn spin crossover complex with atypical two-step hysteretic thermal switching at 74 K and 84 K shows rich structural-magnetic interplay and magnetic-field-induced spin state switching below 14 T with an onset below 5 T. The spin states, structures, and the nature of the phase transitions are elucidated via X-ray and magnetization measurements. An unusual intermediate phase containing four individual sites, where are in a pure low spin state, is observed. The splitting of equivalent sites in the high temperature phase into four inequivalent sites is due to a structural reorganization involving a primary and a secondary symmetry-breaking order parameter that induces a crystal system change from orthorhombic→monoclinic and a cell doubling. Further cooling leads to a reconstructive phase transition and a monoclinic low-temperature phase with two inequivalent low-spin sites. The coupling between the order parameters is identified in the framework of Landau theory.
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https://hal.archives-ouvertes.fr/hal-03433923
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Submitted on : Thursday, November 18, 2021 - 8:32:38 AM
Last modification on : Thursday, May 19, 2022 - 5:11:11 PM
Long-term archiving on: : Saturday, February 19, 2022 - 6:18:17 PM

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Emiel Dobbelaar, Vibe B Jakobsen, Elzbieta Trzop, Minseong Lee, Shalinee Chikara, et al.. Thermal and Magnetic Field Switching in a Two‐Step Hysteretic Mn(III) Spin Crossover Compound Coupled to Symmetry Breakings. Angewandte Chemie International Edition, Wiley-VCH Verlag, 2022, 61 (4), ⟨10.1002/anie.202114021⟩. ⟨hal-03433923⟩

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