Ellipsometric Studies of NdMnO_3 Single Crystals

• Authors: G. Babonas , A. Reza , R. Szymczak , M. Baran , S. Shiryaev , J. Fink-Finowicki , H. Szymczak
• Languages of publication: EN

Abstracts

EN

Ellipsometric studies of NdMnO_3 single crystals of orthorhombic symmetry were carried out in the spectral range 0.5-5.0 eV. Experimental data, which were obtained on the (001)_{pc}-type planes of pseudo-cubic system, were analyzed in the model of biaxial crystal. For the first time, three componentsε_x,ε_y,ε_z of the effective dielectric function for manganites of orthorhombic symmetry were determined. From ellipsometric data, the spectra of optical conductivity and loss function were also calculated and considered. The fine structure of the spectra and optical anisotropy was the basis for discussion of the microscopic origin of the optical transitions responsible for the optical features. The electronic excitations due to dipole-forbidden spin-allowed transitions of the d-d-type in Mn-ions, f-f-type in Nd-ions and charge-transfer 2p(O)-3d(Mn) transitions were taken into account. The data for NdMnO_3 were compared with those obtained for other related undoped and doped single crystals of perovskite-type structure, LaMnO_3, (LaBa)(MnCo)O_3 and (LaCa)CoO_3.

Keywords

EN

71.20.-b; 78.20.Ci

Discipline

• 71.20.-b: Electron density of states and band structure of crystalline solids
• 78.20.Ci: Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 105
• Issue: 1-2
• Pages: 197-208

Dates

published

2004-01/02

received

2003-09-15

Contributors

author

G. Babonas

• Semiconductor Physics Institute, Goštauto 11, 2600 Vilnius, Lithuania

author

A. Reza

• Semiconductor Physics Institute, Goštauto 11, 2600 Vilnius, Lithuania

author

R. Szymczak

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

author

M. Baran

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

author

S. Shiryaev

• Institute of Solid State and Semiconductors Physics, NAS, P. Brovka Street, 220072 Minsk, Belarus

author

J. Fink-Finowicki

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

author

H. Szymczak

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.105.197