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Temperature-dependent and anisotropic optical response of layered Pr 0.5Ca1.5MnO4 probed by spectroscopic ellipsometry
Majidi M.A.a,e, Thoeng E.a, Gogoi P.K.a, Wendt F.b,f, Wang S.H.a, Santoso I.a, Asmara T.C.a, Handayani I.P.c,d, Van Loosdrecht P.H.M.c, Nugroho A.A.c,d, Rubhausen M.a,b, Rusydi A.a,b,d
a NUSNNI-NanoCore, Department of Physics, National University of Singapore, Singapore
b Institut für Angewandte Physik, Universität Hamburg, Germany
c Zernike Institute for Advanced Materials, University of Groningen, Netherlands
d Physics of Magnetism and Photonics, FMIPA, Institut Teknologi Bandung, Indonesia
e Departemen Fisika, FMIPA, Universitas Indonesia, Indonesia
f Center for Free Electron Laser Science (CFEL), 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 the temperature dependence as well as anisotropy of optical conductivity (σ1) in the pseudocubic single crystal Pr 0.5Ca1.5MnO4 using spectrocopic ellipsometry. Three transition temperatures are observed and can be linked to charge-orbital (TCO/OO∼320 K), two-dimensional-antiferromagnetic (2D-AFM) (∼200 K), and three-dimensional AFM (TN∼125 K) orderings. Below TCO/OO, σ1 shows a charge-ordering peak (∼0.8 eV) with a significant blue shift as the temperature decreases. Calculations based on a model that incorporates a static Jahn-Teller distortion and assumes the existence of a local charge imbalance between two different sublattices support this assignment and explain the blue shift. This view is further supported by the partial spectral weight analysis showing the onset of optical anisotropy at TCO/OO in the charge-ordering region (0.5-2.5 eV). Interestingly, in the charge-transfer region (2.5-4 eV), the spectral weight shows anomalies around the T2D-AFM that we attribute to the role of oxygen-p orbitals in stabilizing the CE-type magnetic ordering. Our result shows the importance of spin, charge, orbital, and lattice degrees of freedom in this layered manganite. © 2013 American Physical Society.[/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]https://doi.org/10.1103/PhysRevB.87.235135[/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]