Size effects on the Néel temperature of antiferromagnetic NiO nanoparticles
Among all antiferromagnetic transition metal monoxides, NiO presents the highest Néel 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.
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| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | artículo biblioteca |
| Language: | English |
| Published: |
American Institute of Physics
2016
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| Online Access: | http://hdl.handle.net/10261/369830 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/100011941 http://dx.doi.org/10.13039/501100003176 |
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