Low temperature phonon studies and evidence of structure–spin correlations in MnV2O4

We report here, temperature dependent Raman spectroscopic measurements on polycrystalline MnV2O4 over the temperature range of 10–300 K. The main aim of this study is to investigate the spin–phonon correlations across the magnetic and structural transition temperatures in this system. Temperature de...

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Bibliographic Details
Published in:Journal of applied physics 2020-04, Vol.127 (14)
Main Authors: Singha, Mrittika, Paul, Barnita, Gupta, Rajeev
Format: Article
Language:English
Subjects:
Applied physics
Coupling
Line shape
Low temperature
Magnetic transitions
Phase transitions
Phonons
Spin dynamics
Temperature
Temperature dependence
Transition temperature
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Summary:We report here, temperature dependent Raman spectroscopic measurements on polycrystalline MnV2O4 over the temperature range of 10–300 K. The main aim of this study is to investigate the spin–phonon correlations across the magnetic and structural transition temperatures in this system. Temperature dependent magnetization measurements combined with the low temperature Raman study show the existence of structural changes in MnV2O4 across the two successive phase transitions. Anomalous changes in line shape parameters in some of the Raman modes are observed during temperature dependent Raman measurements, indicating the presence of spin–phonon coupling. A significantly high spin–phonon coupling strength of 5.9 cm−1 suggests alteration of spin dynamics across magnetic transition temperature, TM (57 K).
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5129616