Re-normalization of lattice vibrations below magnetic transition probed by Raman spectroscopy

Polycrystalline CuO thin film is grown using pulse laser deposition method. Magnetic measurement shows reduction in transition temperature from 213 K in bulk to 175 K in thin film which is attributed to the reduction in dimensionality. Temperature dependent Raman study showed existence of strong spi...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2020-02, Vol.579, p.411806, Article 411806
Main Authors: Krishna De, Binoy, Dwij, Vivek, Kunwar, Hemant Singh, Choudhary, R.J., Sathe, V.G.
Format: Article
Language:English
Subjects:
Anharmonicity
Batteries
Coupling
Laser deposition
Lattice vibration
Magnetic measurement
Magnetic transitions
Magnetism
Phonons
Raman spectroscopy
Reduction
Spectrum analysis
Spin-phonon coupling
Temperature
Temperature dependence
Thin films
Transition temperature
Zone folding
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Summary:Polycrystalline CuO thin film is grown using pulse laser deposition method. Magnetic measurement shows reduction in transition temperature from 213 K in bulk to 175 K in thin film which is attributed to the reduction in dimensionality. Temperature dependent Raman study showed existence of strong spin-phonon coupling below 175 K. The spin-phonon coupling constant is deduced by subtracting the variation in Ag mode position from the anharmonic behaviour and is found to be 9.08 cm−1. On the other hand the spin-phonon coupling constant deduced from the shift of the 230 cm−1 mode, which is supposed to be activated due to zone folding and is observed only below 175 K, is found to be ~30 cm−1 against ~50 cm−1 reported in bulk compound using this method.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2019.411806