Pressure effect investigated with first-order reversal-curve method on the spin-transition compounds [Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Zn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>(btr)<mml:mat

The thermal transition accompanied by the variation of the molecular volume in nanoparticles of spin-crossover materials has been studied on the basis of microscopic Ising-like model solved using Monte Carlo methods. For considered model, we examined the spin-crossover phenomenon with applied hydrostatic pressure and thus was shown the possibility to shift transition temperature toward its room value. The obtained results of numerical simulations are in agreement with the experimental ones.

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“…The obtained results of numerical calculations are in agreement with the experiments [1, 2, 6, 11, 12, 18]. …”

Section: Discussionsupporting

confidence: 86%

Study of pressure influence on thermal transition in spin-crossover nanomaterials

2014

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“…30,31 T up (T down ) is the transition temperature on heating (cooling) at m ∼ −0.5 (n HS = 0.25) in our case. This behavior is reproduced by Monte Carlo simulations as well.…”

Section: A Pressure-induced-like Effects Degeneracy and System Sizmentioning

confidence: 67%

Dynamic phase transitions in the one-dimensional spin-phonon coupling model

2013

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An interesting model for spin crossover compounds (SCC) is the so-called spin-phonon coupling model. In this model, the SC units are linked by springs, with elastic constants dependent on their spin states. In the present work, we investigate by means of Monte Carlo Metropolis method, the one-dimensional version of the model at T > 0 K. The relevance of our numerical analysis stands in the possibility of studying this model in the general case, i.e., outside the analytical limits of the mean-field approximation (MFA). First, we investigate a couple of model properties, such as pressure-induced-like effects on thermal hysteresis loops, system size and degeneracy influences on the dynamic phase diagrams. We find a high sensitivity of the hysteresis loops on the system size for small sizes only. Second, we qualitatively compare our results with those analytically obtained in the MFA and determine the limits of the latter. Third, we study the kinetic effects on the dynamic phase diagrams and the critical temperature. We find a slow asymptotic decrease of the critical temperature T c to zero as the kinetics becomes infinitely long. This might be important in the experimental studies of pressure-induced phase transitions for clusters or nanosize SC compounds at low temperatures, as this means that, in practice, there will always be a pseudophase transition, as the measurement time is finite. The transition temperatures are smaller than 0.1 /k B , meaning that is not a question of thermal activation, but it is really the mechanism of spin-phonon coupling that helps the transition from the low-spin to the high-spin level state.

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“…Over the last few years an important effort has been done by different laboratories to explain, experimentally [15][16][17][18][19][20][21][22][23] or theoretically [24][25][26][27][28], different unusual behaviors of SCO complexes under an external applied pressure. Due to the change in the metalligand bond length when the SCO occurs, these materials are highly sensitive to an external applied pressure.…”

Section: Pressure Effectmentioning

confidence: 99%

Thermo- and piezochromic properties of [Fe(hyptrz)]A2·H2O spin crossover 1D coordination polymer: Towards spin crossover based temperature and pressure sensors

Jureschi

Rusu

Codjovi

et al. 2014

Physica B: Condensed Matter

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Pressure effect investigated with first-order reversal-curve method on the spin-transition compounds [FexZn1−x(btr)

Cited by 29 publications

References 30 publications

Study of pressure influence on thermal transition in spin-crossover nanomaterials

Study of pressure influence on thermal transition in spin-crossover nanomaterials

Dynamic phase transitions in the one-dimensional spin-phonon coupling model

Thermo- and piezochromic properties of [Fe(hyptrz)]A2·H2O spin crossover 1D coordination polymer: Towards spin crossover based temperature and pressure sensors

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