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Electron-phonon coupling in APd3O4: A = Ca, Sr, and Sr0.85Li0.15

Authors :
Poojitha, Bommareddy
Reddy, B. H.
Joshi, Aprajita
Kumar, Ankit
Ali, Asif
Singh, R. S.
Saha, Surajit
Source :
Journal of Physics: Condensed Matter 33, 105601 (2020)
Publication Year :
2020

Abstract

Here we have investigated the role of electron-phonon coupling on the Raman spectrum of narrow bandgap semiconductors APd3O4 (A = Ca, Sr) and hole-doped system Sr0.85Li0.15Pd3O4. Four Raman active phonons are observed at room temperature for all three compounds as predicted by factor group analysis. The lowest energy phonon (~190/202 cm-1) associated with Pd vibrations is observed to exhibit an asymmetric Fano-like lineshape in all the three compounds, indicating the presence of an interaction between the phonon and the electronic continuum. The origin of the electronic continuum states and electron-phonon coupling are discussed based on our laser power- and temperature-dependent Raman results. We have observed an enhanced strength of electron-phonon coupling in Sr0.85Li0.15Pd3O4 at low temperatures which can be attributed to the metallicity in this doped compound.<br />Comment: 27 pages, 13 figures, 3 tables

Details

Database :
arXiv
Journal :
Journal of Physics: Condensed Matter 33, 105601 (2020)
Publication Type :
Report
Accession number :
edsarx.2010.08813
Document Type :
Working Paper
Full Text :
https://doi.org/10.1088/1361-648X/abcf60