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Collective orbital excitations in orbitally ordered YVO3 and HoVO3
Benckiser E.a, Ruckamp R., Moller T.a, Taetz T.a, Moller A.a, Nugroho A.A.c,d, Palstra T.T.M.d, Uhrig G.S.e, Gruninger M.a
a II. Physikalisches Institut, Universität zu Köln, Germany
b 2. Physikalisches Institut A, RWTH Aachen University, Germany
c Jurusan Fisika, Institut Teknologi Bandung, Indonesia
d Zernike Institute for Advanced Materials, University of Groningen, Netherlands
e Theoretische Physik I, Technische Universität Dortmund, Germany
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]We study orbital excitations in the optical absorption spectra of YVO 3 and HoVO3. We focus on an orbital absorption band observed at 0.4 eV for polarization E \\c. This feature is only observed in the intermediate, monoclinic phase. By comparison with the local crystal-field (CF) excitations in VOCl and with recent theoretical predictions for the CF levels we show that this absorption band cannot be interpreted in terms of a local CF excitation. We discuss a microscopic model which attributes this absorption band to the exchange of two orbitais on adjacent sites, i.e. to the direct excitation of two orbitons. This model is strongly supported by the observed dependence on polarization and temperature. Moreover, the calculated spectral weight is in good agreement with the experimental result. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Optical absorption spectrum,Orbital excitations[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1088/1367-2630/10/5/053027[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]