Simple Two-Dimensional Model for the Elastic Origin of Cooperativity among Spin States of Spin-Crossover Complexes

Nishino, Masamichi; Boukheddaden, Kamel; Konishi, Yu; Miyashita, Seiji

doi:10.1103/physrevlett.98.247203

Cited by 172 publications

(120 citation statements)

References 30 publications

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“…Intermolecular control of thermoswitching and photoswitching phenomena in two spin-crossover polymorphs. Physical Review B : Condensed matter and materials physics, American Physical Society, 2012, 85 (6), 064114 (9 p.). <10.1103/PhysRevB.85.064114>.…”

Section: To Cite This Versionmentioning

confidence: 99%

“…This is exemplified by spin crossover compounds [3][4][5] where cooperative switching between low-spin (LS) and high-spin (HS) molecular states is governed by elastic interactions in relation with the change of cell volume. 6 An exceptional feature is the possibility of exhibiting such a switching both at thermal equilibrium, under control of temperature or pressure, as well as far away from equilibrium under control with light irradiation. 7,8 It gives a nice opportunity to look into the interrelation between the physics of phase transition and that of nonlinear dynamics because these are the same cooperative interactions, that govern the stability of macroscopic states both at thermal equilibrium and out of equilibrium.…”

Section: Introductionmentioning

confidence: 99%

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Intermolecular control of thermoswitching and photoswitching phenomena in two spin-crossover polymorphs

et al. 2012

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We discuss here the important role of intermolecular coupling for the thermal-and light-induced molecular state switching in the solid state. Investigations were performed on the two crystalline polymorphs of the spin-crossover [Fe-(PM-BIA) 2 (NCS) 2 ] material. In addition to structural studies at thermal equilibrium, lightinduced phenomena were investigated through photocrystallography, photomagnetic, and dynamical optical measurements. Strong similarities between the thermal-equilibrium and the out-of-equilibrium light-induced transformations are observed in each polymorph: strong cooperative phenomena in one polymorph versus weak cooperative ones in the second polymorph. These different responses of the two crystalline forms of the compound to external perturbations are discussed at the microscopic level in terms of Ising-like model and two-mode description of on-site molecular potentials.

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Section: To Cite This Versionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Intermolecular control of thermoswitching and photoswitching phenomena in two spin-crossover polymorphs

et al. 2012

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“…[12][13][14][15] Here, photons bring about a charge transfer from the neighboring Fe ions to Co ions, associated with the spin-state change in Co ions from the low-spin (LS) state to the high-spin (HS) one. A main mechanism of the cooperative spinstate transition in a series of materials is supposed to be the elastic interaction; [16][17][18][19] a local volume change of a metal-ligand cluster propagates over a crystal lattice.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced magnetic bound state in an itinerant correlated electron system with a spin-state degree of freedom

2012

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Photo-excited state in correlated electron system with spin-state degree of freedom is studied. We start from the two-orbital extended Hubbard model where energy difference between the two orbitals is introduced. Photo-excited metastable state is examined based on the effective model Hamiltonian derived by the two-orbital Hubbard model. Spin-state change is induced by photoirradiation in the low-spin band insulator near the phase boundary. High-spin state is stabilized by creating a ferromagnetic bound state with photo-doped hole carriers. An optical absorption occurs between the bonding and antibonding orbitals inside of the bound state. Time-evolution for photo-excited states is simulated in the time-dependent mean-field scheme. Pair-annihilations of the photo-doped electron and hole generate the high-spin state in a low-spin band insulator. We propose that this process is directly observed by the time-resolved photoemission experiments.

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“…At variance from these electronic models, the continuous medium model developed by Spiering [7] showed that an elastic interaction could as well give rise to the observed first-order transitions. More recently, discrete models based on deformable lattices [8][9][10][11][12][13][14][15][16] were introduced so as to mimic the spatio-temporal features revealed by optical microscopy investigations [17][18][19] for the nucleation and growth of the spin state phases at the thermal transition of SCO single crystals. They conciliate the continuous medium and discrete lattice approaches, with purely elastic interactions, so as to reproduce both lattice and spin transformations of the system.…”

Section: Introductionmentioning

confidence: 99%

Multistep Relaxations in a Spin-Crossover Lattice with Defect: A Spatiotemporal Study of the Domain Propagation

et al. 2016

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Abstract:We study the spatio-temporal formation and spreading of the low-spin state (LS) during the thermal spin transition and the cooperative relaxation of the photo-induced metastable high spin (HS) state at low temperature, in the presence of a structural defect. The model is made of a two-dimensional rectangular-shaped lattice with discrete spins coupled by springs. The investigations are performed for a perfect lattice and a lattice with a hole (simulating the defect) with a fixed size. We found that the presence of the defect affects the thermal equilibrium by reducing the size of the thermal hysteresis at the transition, although the transition temperature remains unchanged. The study of the low-temperature relaxation of the defect-free lattice from HS to LS state indicated the existence of three different regimes of the growth process: (i) a first regime of growth from one corner of the rectangle along the width, then followed by (ii) a second regime of longitudinal propagation at almost constant velocity, and (iii) a third rapid regime when the system feels the surface or the border of the crystal. When a hole is injected inside the lattice, it results in (i) the deformation of the HS/LS interface's shape when it approaches the defect position; and (ii) the slowing down of its propagation velocity. These results, which are in good agreement with available experimental data, are discussed in terms of elastic energy stored in the system during the relaxation process.

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Simple Two-Dimensional Model for the Elastic Origin of Cooperativity among Spin States of Spin-Crossover Complexes

Cited by 172 publications

References 30 publications

Intermolecular control of thermoswitching and photoswitching phenomena in two spin-crossover polymorphs

Intermolecular control of thermoswitching and photoswitching phenomena in two spin-crossover polymorphs

Photoinduced magnetic bound state in an itinerant correlated electron system with a spin-state degree of freedom

Multistep Relaxations in a Spin-Crossover Lattice with Defect: A Spatiotemporal Study of the Domain Propagation

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