Enhanced Cooperative Interactions at the Nanoscale in Spin-Crossover Materials with a First-Order Phase Transition
authors Felix, G; Nicolazzi, W; Salmon, L; Molnar, G; Perrier, M; Maurin, G; Larionova, J; Long, J; Guari, Y; Bousseksou, A
journal PHYSICAL REVIEW LETTERS
keywords ISING-LIKE MODEL; THERMAL HYSTERESIS; ROOM-TEMPERATURE; SIZE DEPENDENCE; NANOPARTICLES; NANOCRYSTALS; BISTABILITY; COMPLEXES
abstract We analyzed the size effect on a first-order spin transition governed by elastic interactions. This study was performed in the framework of a nonextensive thermodynamic core-shell model. When decreasing the particle size, differences in surface energies between the two phases lead to the shrinking of the thermal hysteresis width, the lowering of the transition temperature, and the increase of residual fractions at low temperature, in good agreement with recent experimental observations on spin transition nano-materials. On the other hand, a modification of the particle-matrix interface may allow for the existence of the hysteresis loop even at very low sizes. In addition, an unexpected reopening of the hysteresis, when the size decreases, is also possible due to the hardening of the nanoparticles at very small sizes, which we deduced from the size dependence of the Debye temperature of a series of coordination nanoparticles.
publisher AMER PHYSICAL SOC
issn 0031-9007
year published 2013
volume 110
issue 23
digital object identifier (doi) 10.1103/PhysRevLett.110.235701
web of science category Physics, Multidisciplinary
subject category Physics
unique article identifier WOS:000320115000015
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journal analysis (jcr 2019):
journal impact factor 8.385
5 year journal impact factor 8.215
category normalized journal impact factor percentile 93.529
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