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Raman and infrared study of 4f electron-phonon coupling in HoVO3
Roberge B.a, Balli M.a, Jandl S.a, Fournier P.a,b, Palstra T.T.M.c, Nugroho A.A.d
a Regroupement Québecois sur les Matériaux de Pointe, Département de Physique, Université de Sherbrooke, J1K 2R1, Canada
b Canadian Institute for Advanced Research, Toronto, M5G 1Z8, Canada
c Solid State Chemistry Laboratory, Zernike Institute for Advanced Materials, University of Groningen, Groningen, 9747 AG, Netherlands
d Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, 40132, Indonesia
[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]© 2016 IOP Publishing Ltd.First-order Raman scattering and multiphonons are studied in RVO3 (R = Ho and Y) as a function of temperature in the orthorhombic and monoclinic phases. Raman spectra of HoVO3 and YVO3 unveil similar features since both compounds have nearly identical R-radii. However, the most important difference lies in the transition temperature involving the V3+ orbitals, the V3+ magnetic moments as well as the crystallographic structure. Particularly, the magnetic and orbital reorientations occur at T N2 = 40 K for HoVO3 instead T N2 =77 K in the case of YVO3. For both systems, anomalous phonon shifts which are related to spin-phonon coupling are observed below the V3+ magnetic ordering temperature (T N1 ≈ 110 K) while additional phonon anomalies are exclusively observed in HoVO3 around T ∗ ≈ 15 K. On the other hand, infrared (IR) transmittance measurements as a function of temperature reveal Ho3+5I8 → 5I7 excitations and additional excitations assigned as vibronics. These latter combined with drastic changes in Ho3+5I8 → 5I7 excitations at T N2, are indicative of a strong coupling between the Ho3+ ions and the ligand field. This could explain the large magnetocaloric capacity shown by HoVO3.[/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]Additional excitations,Crystallographic structure,First-order Raman scattering,HoVO3,Magnetic ordering temperatures,Monoclinic phasis,Spin-phonon coupling,Transmittance measurements[/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]HoVO3,infrared spectroscopy,Raman spectroscopy,spin-phonon coupling[/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/10.1088/0953-8984/28/43/435401[/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]