Evidence of spin-phonon interactions in MgCu 2 O 3 : low temperature Raman studies

Evidence of spin-phonon interactions in MgCu 2 O 3 : low temperature Raman studies

Experimental low temperature Raman spectroscopy studies upto the temperature of 83 K were performed on MgCu 2 O 3 compound using 785 nm excitation source. Experimentally obtained Raman spectra compare well with those obtained from DFPT calculations. Phonon modes show different behaviour below and ab...

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Veröffentlicht in:Physica scripta 2024-09, Vol.99 (9), p.95910
Hauptverfasser: Chandra, Somesh, Kaur, Gurpreet, Gupta, Rajkumar, Chakravarty, Sujay, Bhalerao, G M, R, Govindaraj
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container_issue 9
container_start_page 95910
container_title Physica scripta
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creator Chandra, Somesh
Kaur, Gurpreet
Gupta, Rajkumar
Chakravarty, Sujay
Bhalerao, G M
R, Govindaraj
description Experimental low temperature Raman spectroscopy studies upto the temperature of 83 K were performed on MgCu 2 O 3 compound using 785 nm excitation source. Experimentally obtained Raman spectra compare well with those obtained from DFPT calculations. Phonon modes show different behaviour below and above the Néel temperature ∼95 K. Anharmonic contribution is prominent above the Néel temperature but a significant departure from the anharmonic behaviour was observed for certain A g and B 3 g modes below the Néel temperature. This behaviour is attributed to spin-phonon coupling present in the compound. The spin-phonon coupling arises due to modulation in the exchange integral by the lattice vibrations. The atomic vibrations of each mode and their effect on the exchange integral are discussed.
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title Evidence of spin-phonon interactions in MgCu 2 O 3 : low temperature Raman studies
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