title: Role of Temperature and Pressure on the Multisensitive Multiferroic Dicyanamide Framework [TPrA][Mn(dca)3] with Perovskite-like Structure.
abstract: A multistimuli response to temperature and pressure is found in the hybrid inorganic-organic perovskite-like [TPrA][Mn(dca)3] compound, which is related to a first-order structural phase transition near room temperature, Tt ≈ 330 K. This phase transition involves a transformation from room temperature polymorph I, with the noncentrosymmetric space group P4̅21c, to the high temperature polymorph II, with the centrosymmetric space group I4/mcm, and it implies ionic displacements, order-disorder phenomena, and a large and anisotropic thermal expansion (specially along the c-axis). As a consequence, [TPrA][Mn(dca)3] exhibits a dielectric anomaly, associated with the change from a cooperative to a noncooperative electric behavior (antiferroelectric (AFE)-paraelectric (PE) transition). The former implies an AFE distribution of electric dipoles in polymorph I, related to the described off-shift of the apolar TPrA cations and the order-disorder of the polar dca ligands mechanisms, that are different from those reported, up to now, for others perovskite-type hybrid compounds. Such cooperative electric order, below Tt ≈ 330 K, coexisting with long-range antiferromagnetic ordering below T = 2.1 K render the [TPrA][Mn(dca)3] a new type-I multiferroic material. In addition, the obtained experimental results reveal that this compound is also a multistimuli-responsive material, with a very large sensitivity toward temperature and applied external pressure, δTt/δP ≈ 24 K kbar(-1), even for small values of pressure (P < 2 kbar). Therefore, this material opens up a potential interest for future technological applications, such as temperature/pressure sensing.
authors.affiliation: QuiMolMat Group, Department of Fundamental Chemistry, Faculty of Science and CICA, University of A Coruña , Campus A Coruña, 15071 A Coruña, Spain.
authors.forename: Juan M
authors.initials: JM
authors.lastname: Bermúdez-García
authors.affiliation: QuiMolMat Group, Department of Fundamental Chemistry, Faculty of Science and CICA, University of A Coruña , Campus A Coruña, 15071 A Coruña, Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: Sánchez-Andújar
authors.affiliation: QuiMolMat Group, Department of Fundamental Chemistry, Faculty of Science and CICA, University of A Coruña , Campus A Coruña, 15071 A Coruña, Spain.|Department of Applied Physics, University of Santiago de Compostela , 15782 Santiago de Compostela, Spain.
authors.forename: Susana
authors.initials: S
authors.lastname: Yáñez-Vilar
authors.affiliation: QuiMolMat Group, Department of Fundamental Chemistry, Faculty of Science and CICA, University of A Coruña , Campus A Coruña, 15071 A Coruña, Spain.
authors.forename: Socorro
authors.initials: S
authors.lastname: Castro-García
authors.affiliation: Department of Industrial Engineering II, University of A Coruña . Campus Ferrol, 15403 Ferrol, Spain.
authors.forename: Ramón
authors.initials: R
authors.lastname: Artiaga
authors.affiliation: Department of Industrial Engineering II, University of A Coruña . Campus Ferrol, 15403 Ferrol, Spain.
authors.forename: Jorge
authors.initials: J
authors.lastname: López-Beceiro
authors.affiliation: Material Physical Center, CSIC-UPV/EHU, P. Manuel de Lardizabal 5, 20018 Donostia-San Sebastian, Spain.
authors.forename: Luis
authors.initials: L
authors.lastname: Botana
authors.affiliation: Material Physical Center, CSIC-UPV/EHU, P. Manuel de Lardizabal 5, 20018 Donostia-San Sebastian, Spain.|Material Physical Department, University of the Basque Country , PO Box 1072, 20008 Donostia-San Sebastian, Spain.
authors.forename: Ángel
authors.initials: Á
authors.lastname: Alegría
authors.affiliation: QuiMolMat Group, Department of Fundamental Chemistry, Faculty of Science and CICA, University of A Coruña , Campus A Coruña, 15071 A Coruña, Spain.
authors.forename: María A
authors.initials: MA
authors.lastname: Señarís-Rodríguez