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The interplay between the orbital ordering and the spin state in Jahn-Teller Mn3+ governing the optical,\udmagnetic, and transport properties in the layered CsMnF4 perovskite is investigated. Such electronic effects are\udstrongly coupled to the lattice and thus can be modified by external pressure. However, there is very little\udunderstanding of the structural conditions which are required to attain spin crossover in connection with the\udelectronic structure of Mn3+. The distortion, spin state, and tilting of MnF6 octahedra in the insulating\udferromagnet CsMnF4 are jointly studied by high-pressure optical spectroscopy. The insulating character of\udCsMnF4 allowed us to explore the electronic structure associated with the 3d levels of Mn3+ in the 0–46 GPa\udpressure range, an information which is obscured in most oxides due to metallization at high pressure. We\udshow that the spin-crossover transition, related to the spin change, S=2→1, in Mn3+, takes place at 37 GPa\udwith the simultaneous suppression of the axially elongated distortion associated with the Jahn-Teller effect. The\udwide stability pressure range of the Jahn-Teller distortion and high-spin state is explained in terms of crystalfield\udmodels including the Jahn-Teller stabilization energy. On this basis, we discuss the interplay between spin\udtransition and Jahn-Teller effect comparing present findings with other results attained in Mn3+, Ni3+, and Co3

physical review b

Pressure-induced Jahn-Teller suppression and simultaneous high-spin to low-spin transition in the layered perovskite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Cs</mml:mi><mml:mi mathvariant="normal">Mn</mml:mi><mml:msub><mml:mi mathvariant="normal">F</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Pressure-induced Jahn-Teller suppression and simultaneous high-spin to low-spin transition in the layered perovskiteCsMnF4