Abstract
We report an application of low-temperature Raman scattering on in-plane CuO nanowires, in which an overview of the characteristic parameter of spin-phonon coefficient, the interaction of incident light with the spin degrees of freedom, and size effects will be given. The appearance of spin-phonon coefficient decrease reflects the existence of finite size effect.
Highlights
Low-dimensional nanosized effects in CuO systems, especially their different physical properties such as spin-spin [1,2], electron–phonon [3], spin-phonon interactions [4], and giant negative thermal expansion have recently received a lot of attention [5]
Our results reveal that below Néel temperature there is a ready shift of the spin-phonon coefficient λsp decreases as the mean diameter of in-plane CuO nanowire decreases, exhibiting a long- to shortrange spin-phonon coupling that can be nicely described with the expected theoretical order parameter as due to antiferromagnetic ordering in in-plane CuO nanowires
The results were utilized to investigate the spectroscopic properties of CuO nanowire at various temperatures
Summary
Low-dimensional nanosized effects in CuO systems, especially their different physical properties such as spin-spin [1,2], electron–phonon [3], spin-phonon interactions [4], and giant negative thermal expansion have recently received a lot of attention [5]. A transition from a first-order transition to a commensurate antiferromagnetic state near TN ~ 213 K reported for bulk CuO from neutron scattering experiments [7,8] is well understood. Controlling the size of CuO nanocrystals resulted in short-range correlation and commensurate antiferromagnetic (AFM) ordering, where the TN decreased from the bulk value of 213 K [9,10,11], with decreasing particle size, down to 40 K for 6.6-nm nanoparticles [1,2] and 13 K for 2- to 3-nm nanorods [12].
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