title: Reversible Control by Light of the High-Spin Low-Spin Elastic Interface inside the Bistable Region of a Robust Spin-Transition Single Crystal.
abstract: By using a weak modulated laser intensity we have succeeded in reversibly controlling the dynamics of the spin-crossover (SC) single crystal [{Fe(NCSe)(py)2 }2 (m-bpypz)] inside the thermal hysteresis. The experiment could be repeated several times with a reproducible response of the high-spin low-spin interface and without crystal damage. In-depth investigations as a function of the amplitude and frequency of the excitation brought to light the existence of a cut-off frequency ca. 1.5 Hz. The results not only document the applicability of SC materials as actuators, memory devices, or switches, but also open a new avenue for the reversible photo-control of the spin transition inside the thermal hysteresis.
authors.affiliation: Groupe d'Etudes de la Matière Condensée, CNRS-Université de Versailles; Université Paris Saclay, 45 Avenue des Etats Unis, 78035, Versailles Cedex, France.
authors.forename: Mouhamadou
authors.initials: M
authors.lastname: Sy
authors.affiliation: Groupe d'Etudes de la Matière Condensée, CNRS-Université de Versailles; Université Paris Saclay, 45 Avenue des Etats Unis, 78035, Versailles Cedex, France.
authors.forename: Damien
authors.initials: D
authors.lastname: Garrot
authors.affiliation: Laboratoire des Matériaux Ferroélectriques, Département de Physique, Faculté des Sciences de Sfax, Route de Soukra km 3.5 BP 1171, 3018, SFax, Tunisia.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Slimani
authors.affiliation: Groupe d'Etudes de la Matière Condensée, CNRS-Université de Versailles; Université Paris Saclay, 45 Avenue des Etats Unis, 78035, Versailles Cedex, France.
authors.forename: Miguel
authors.initials: M
authors.lastname: Páez-Espejo
authors.affiliation: Groupe d'Etudes de la Matière Condensée, CNRS-Université de Versailles; Université Paris Saclay, 45 Avenue des Etats Unis, 78035, Versailles Cedex, France.
authors.forename: François
authors.initials: F
authors.lastname: Varret
authors.affiliation: Groupe d'Etudes de la Matière Condensée, CNRS-Université de Versailles; Université Paris Saclay, 45 Avenue des Etats Unis, 78035, Versailles Cedex, France. kbo@physique.uvsq.fr.
authors.forename: Kamel
authors.initials: K
authors.lastname: Boukheddaden
keywords: elastic interface; optical microscopy; phase transition; spatio-temporal properties; spin-crossover