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Raman study of crystal-field excitations in Nd2CuO4 under pressure
Loa I.a, Divis M.b, Nekvasil V., Jandl S.d, Syassen K.a, Nugroho A.A.f, Menovsky A.A.
a Max-Planck-Institut für Festkörperforschung, Germany
b Department of Electron Systems, Charles University, Czech Republic
c Institute of Physics, Czech Academy of Sciences, Czech Republic
d Centre de Recherche sur les proprietes Electroniques des Materiaux Avances, Département de physique, Université de Sherbrooke, Canada
e Van der Waals-Zeeman Institute, University of Amsterdam, Netherlands
f Jurusan Fisika, Institut Teknologi Bandung, 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]The effect of hydrostatic pressure on crystal-field (CF) levels of Nd3+ in Nd2CuO4 has been studied. Raman spectroscopy was used to measure the pressure dependences of two CF transitions near 750 cm-1 and 1995 cm-1 at T = 5 K. On the basis of the superposition model and an ab initio method we calculated the CF level energies as a function of pressure. Good agreement with the experimental data is found for the 750-cm-1 excitation while deviations in case of the 1995-cm-1 transitions can be attributed to changes of the free-ion parameters of the Hamiltonian. Pressure-induced changes in the splitting of the 1995-cm-1 doublet are interpreted considering the anisotropy of the Nd-Cu exchange coupling. Experiments at T = 44 K indicate a possible pressure-induced magnetic reorientation transition similar to what was observed earlier around T = 30 K as a function of temperature.[/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][/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][/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]