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Coupled ferroelastic distortion and spin crossover in the Fe(PM-PEA)2(NCS)2 system: a Landau theory approach

hal.structure.identifierInstitut de Physique de Rennes [IPR]
dc.contributor.authorTORRES, Ricardo
hal.structure.identifierInstitut de Physique de Rennes [IPR]
hal.structure.identifierInstituto de Ciencia Molecular [ICMol]
dc.contributor.authorVALVERDE MUÑOZ, Francisco Javier
hal.structure.identifierInstitut de Physique de Rennes [IPR]
hal.structure.identifierDynamical Control of Materials [DYNACOM]
dc.contributor.authorTRZOP, Elzbieta
hal.structure.identifierInstitut de Physique de Rennes [IPR]
hal.structure.identifierDynamical Control of Materials [DYNACOM]
dc.contributor.authorCOLLET, Eric
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCHASTANET, Guillaume
dc.date.accessioned2024-03-26T03:07:56Z
dc.date.available2024-03-26T03:07:56Z
dc.date.conference2022-11-22
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/188979
dc.description.abstractEnPhase transitions give rise to different and unique modifications of physical properties in materials. Understanding these changes of state and their origin is of great interest for the further tuning of such properties, through the application of external stimuli, just as temperature, pressure, electric or magnetic fields, and light irradiation.1,2In this sense, the classical Landau theory is a useful tool for the description of different ordering phenomena, taking place during phase transitions, originally through the evolution of symmetry-breaking order parameters, which measure the deviation from the high-symmetry phase.2 Due to entropy gain, it is the disordered high symmetry phase that is stable at high temperature, in contrast to the ordered low symmetry phase, which is stable at low temperature. In addition, there are many materials, like charge-transfer, spin-crossover, and Mott insulator systems, in which the phase transition is related to an electronic instability without symmetry-breaking. In these cases, the non-symmetry-breaking phase transition should be depicted with the evolution of another order parameter, accounting for the aforementioned electronic instability.1For some materials, like in the case of spin-crossover systems, both, electronic and structural order instabilities may couple. This can result in the widening of hysteresis loops between high- and low- spin phases or in a step-wise evolution of the transition.3 In order to describe the aforementioned phenomena, the addition of the symmetry-allowed coupling terms to the Landau theory main equation is needed.In this work, we are interested in the [Fe(PM-PEA)2(NCS)2] system exhibiting a spin transition coupled to a ferroelastic symmetry-breaking. In particular, this system is unusual because it presents a high symmetry configuration (orthorhombic – Pccn) for the low-temperature low-spin state, while the high-temperature high-spin state is in a low-symmetry phase (monoclinic – P21/c).3,4 In this poster, we will show a way to rationalize this unusual behavior within the Landau theory framework, towards the reproduction and understanding of the experimentally observed asymmetric spin-transition hysteresis loop, and coupled changes of spin state and symmetry of the crystal.
dc.language.isoen
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.title.enCoupled ferroelastic distortion and spin crossover in the Fe(PM-PEA)2(NCS)2 system: a Landau theory approach
dc.typeAutre communication scientifique (congrès sans actes - poster - séminaire...)
dc.subject.halPhysique [physics]
bordeaux.hal.laboratoriesInstitut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026*
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionBordeaux INP
bordeaux.institutionCNRS
bordeaux.conference.titleJournées Scientifiques de l'Associacion Française de Magnétisme Moléculaire 2022
bordeaux.countryFR
bordeaux.conference.cityDourdan
bordeaux.peerReviewedoui
hal.identifierhal-03857174
hal.version1
hal.invitednon
hal.proceedingsnon
hal.conference.organizerAssociacion Française de Magnétisme Moléculaire
hal.conference.end2022-11-24
hal.popularnon
hal.audienceNationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03857174v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.au=TORRES,%20Ricardo&VALVERDE%20MU%C3%91OZ,%20Francisco%20Javier&TRZOP,%20Elzbieta&COLLET,%20Eric&CHASTANET,%20Guillaume&rft.genre=conference


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