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Temperature-induced electron-phonon coupling behaviour of AgGaS2 probed by Brillouin spectroscopy

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dc.contributor.author Kavitha, C.
dc.contributor.author Narayana, Chandrabhas
dc.date.accessioned 2017-02-16T11:32:48Z
dc.date.available 2017-02-16T11:32:48Z
dc.date.issued 2014
dc.identifier.citation Kavitha, C; Narayana, C, Temperature-induced electron-phonon coupling behaviour of AgGaS2 probed by Brillouin spectroscopy. Solid State Communications 2014, 195, 10-15, http://dx.doi.org/10.1016/j.ssc.2014.06.005 en_US
dc.identifier.citation Solid State Communications en_US
dc.identifier.citation 195 en_US
dc.identifier.issn 0038-1098
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/10572/2314
dc.description Restricted Access en_US
dc.description.abstract Low temperature Brillouin scattering studies on Chalcopyrite AgGaS2 have been carried out between the temperatures ranges 20-300 K. We observe the Brillouin modes for AgGaS2 as follows: for crossed polarization (VH) the two modes are around 5.4 and 18 GHz, labelled as RSW1 (Rayleigh surface mode), LA (longitudinal) modes and for parallel polarization (HH), we see the modes are around 4.5 and 11 GHz, labelled as RSW2, TA (transverse acoustic). According to this acoustic phonon mode behaviour with temperature, we do see phase transition at 80 K for AgGaS2. The phase change observed at 80 K is attributed to a strong electron-phonon coupling between the acoustic modes, which modulates the acoustic mode frequency 10-15%. The strong electron-phonon coupling between acoustic modes (LA and TA), which is seen from the anomalous behaviour below 80 K. shows the electronic transition to be of the type direct to indirect band gap. The sound velocity and elastic constants have been calculated using Brillouin modes, which are in good agreement with previous reports. (C) 2014 Elsevier Ltd. All rights reserved. en_US
dc.description.uri 1879-2766 en_US
dc.description.uri http://dx.doi.org/10.1016/j.ssc.2014.06.005 en_US
dc.language English en
dc.language.iso English en_US
dc.publisher Pergamon-Elsevier Science Ltd en_US
dc.rights @Pergamon-Elsevier Science Ltd, 2014 en_US
dc.subject Condensed Matter Physics en_US
dc.subject Aggas2 en_US
dc.subject Crystal Growth en_US
dc.subject Chalcopyrite en_US
dc.subject Nonlinear Optical Property en_US
dc.subject Brillouin Spectroscopy en_US
dc.subject Silver Thiogallate Aggas2 en_US
dc.subject X-Ray en_US
dc.subject Thermal-Expansion en_US
dc.subject Dependence en_US
dc.subject Semiconductors en_US
dc.subject Scattering en_US
dc.title Temperature-induced electron-phonon coupling behaviour of AgGaS2 probed by Brillouin spectroscopy en_US
dc.type Article en_US


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