| Title: |
Stabilizing low symmetry-based functions of materials at room temperature through isosymmetric electronic bistability |
| Authors: |
Valverde Muñoz, Francisco Javier; Torres Ramírez, Ricardo Guillermo; Trzop, Elzbieta; Bataille, Thierry; Daro, Nathalie; Denux, Dominique; Guionneau, Philippe; Cailleau, Hervé; Chastanet, Guillaume; Le Guennic, Boris; Collet, Eric |
| Contributors: |
Institut de Physique de Rennes (IPR); Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS); Institut des Sciences Chimiques de Rennes (ISCR); Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes); Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS); Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB); Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS); This work was supported in part by Agence Nationale de la Recherche for financial support under the grant ANR-19-CE30-0004 ELECTROPHONE, ANR-19-CE07-0027 SMAC. E. C. thanks the University Rennes and the Fondation Rennes 1 for funding. The support of the European Social Fund (ESF) and Generalitat Valenciana for his postdoctoral fellowship (APOSTD/2021/359) and Région Bretagne (BIENVENÜE). This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 899546. The authors thank Région Bretagne, Ille-Et-Vilaine Department, French Ministry of Research, Rennes Métropole, CNRS, European Union for financial support (CPER Project Mat&Trans 2021–2027). The French GENCI/IDRIS-CINES centers for high-performance computing resources are also acknowledged.; ANR-19-CE30-0004,ELECTROPHONE,Transitions de phase ELECTROnique de matériaux moleculaires controllées par PHONONIQUE non-linéaire(2019); ANR-19-CE07-0027,SMAC,Composés avancés multifonctionnels commutables(2019); European Project: 899546,H2020-MSCA-COFUND-2019,H2020-MSCA-COFUND-2019,BIENVENUE(2020) |
| Source: |
ISSN: 2051-6347 ; Materials Horizons ; https://hal.science/hal-04933360 ; Materials Horizons, 2025, 12 (5), pp.1463-1472. ⟨10.1039/D4MH01318B⟩. |
| Publisher Information: |
CCSD; the Royal Society of Chemistry |
| Publication Year: |
2025 |
| Subject Terms: |
[PHYS]Physics [physics]; [CHIM]Chemical Sciences |
| Description: |
International audience ; Symmetry-breaking is pivotal for controlling ferroelectric, ferroelastic and/or ferromagnetic functions of materials, which enables applications in sensors, memory devices, transducers or actuators. Commonly, ferroic phases emerge from descending symmetry-breaking, as the laws of thermodynamics dictate that the ordered low entropy phases form at low temperature, which limits practical applications of many materials at room temperature. Rare examples of ascending symmetry-breakings have been observed, but the driving force remains often unclear. Here, we report on a ferroelastic symmetry-breaking occurring at high temperature in a spin-crossover material, studied by magnetic, DSC and X-ray diffraction measurements. Our DFT calculations and our model, based on the Landau theory of phase transitions, explain how the cooperative thermal switching of the molecular spin state drives a ferroelastic symmetry breaking at high temperature, through a coupled Jahn–Teller distortion. Ferroelastic materials have rich properties, with important applications in memory, multifunctional and novel controllable devices. The electronic bistability in soft functional materials represents an important source of entropy gain, capable of overcoming the cost of symmetry-breaking entropy, which opens up new perspectives for stabilizing high-temperature and low-symmetry ferroic functions of advanced materials. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
info:eu-repo/grantAgreement//899546/EU/Welcoming highly-talented international post-docs in Brittany/BIENVENUE |
| DOI: |
10.1039/D4MH01318B |
| Availability: |
https://hal.science/hal-04933360; https://hal.science/hal-04933360v1/document; https://hal.science/hal-04933360v1/file/Mater-Horiz_2025_D4MH01318B.pdf; https://doi.org/10.1039/D4MH01318B |
| Rights: |
https://creativecommons.org/licenses/by/4.0/ ; info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.A711890F |
| Database: |
BASE |