Size effects on the Neél temperature of antiferromagnetic NiO nanoparticles
Resumen: Among all antiferromagnetic transition metal monoxides, NiO presents the highest Neél temperature (TN ~ 525 K). In this work, the size-dependent reduction of TN in NiO nanoparticles with average diameters (D) ranging from 4 to 9 nm is investigated by neutron diffraction. The scaling law followed by TN(D) is in agreement with the Binder theory of critical phenomena in low-dimensional systems. X-ray absorption fine structure measurements link the decrease of TN to the occurrence of size effects (average undercoordination, bond relaxation and static disorder) in the nearest and next-nearest Ni coordination shells that hold the key for the maintenance of the antiferromagnetic order.
Idioma: Inglés
DOI: 10.1063/1.4943062
Año: 2016
Publicado en: AIP advances 6, 5 (2016), 056104 [5pp]
ISSN: 2158-3226

Factor impacto JCR: 1.568 (2016)
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 164 / 275 = 0.596 (2016) - Q3 - T2
Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 63 / 87 = 0.724 (2016) - Q3 - T3
Categ. JCR: PHYSICS, APPLIED rank: 82 / 147 = 0.558 (2016) - Q3 - T2

Factor impacto SCIMAGO: 0.956 - Physics and Astronomy (miscellaneous) (Q1) - Nanoscience and Nanotechnology (Q2)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2011-27573-C04
Tipo y forma: Article (Published version)

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 Record created 2016-04-08, last modified 2020-02-21

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