[vc_empty_space][vc_empty_space]
Anisotropy of the neodymium-copper exchange interaction in Nd 2CuO4
Nugroho A.A.b, Nekvasil V., Veltrusky I., Jandl S.d, Richard P.d, Menovsky A.A., De Boer F.R., Franse J.J.M.
a Van der Waals – Zeeman Instituut, Universiteit Van Amsterdam, Netherlands
b Jurusan Fisika Institut Teknologi Bandung, Indonesia
c Institute of Physics, Czech Academy of Sciences, Czech Republic
d Département de Physique, Université de Sherbrooke, Canada
[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]A recent infrared transmission study of the 4IJ, J = 9/2, 11/2, 13/2 and 15/2 multiplets of Nd3+ in the antiferromagnetic Nd2 CuO4 single crystals has revealed a splitting of the Kramers doublets of the order of a few cm -1 due to the exchange interaction between Nd and Cu. The present paper shows that these splittings can be described by an effective anisotropic exchange Hamiltonian for the Nd 3+ ion expressed in terms of single-electron spherical tensor operators up to the sixth order, applicable to all levels of the 4f3+ configuration. A least-squares fit of the eight observed splittings using six parameters provides a good description of the splittings. The contributions of the second- and fourth-order terms to the splittings are two orders of magnitude larger than that of the isotropic term in the exchange operator. This finding is compatible with symmetry considerations indicating that the isotropic term in the Hamiltonian vanishes in the case when only the nearest Cu neighbors of Nd are considered. © 2001 Elsevier Science B.V. All rights reserved.[/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]Anisotropic exchange,Antiferromagnetics,Exchange operators,Kramers doublet,Least squares fit,Orders of magnitude,Single electron,Symmetry consideration[/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]Exchange coupling-anisotropic[/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]We thank M.O. Tjia for a careful reading as well as useful comments of the manuscript. V.N. and I.V. gratefully acknowledge the Grant Agency of the Czech Republic for its Grant No. 202/00/1602. This work was supported by Van der Waals–Zeeman Instituut.[/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/10.1016/S0304-8853(00)01163-X[/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]