Contribution of carriers to optical conductivity spectra of lanthanum manganites

Ellipsometric investigation of the optical properties of YFe2 and TbFe2 intermetalic compounds have been carried out in wavelength range of 0.22 –15 μm. A number of electronic and spectral characteristic was determined. Nature of interband light absorption in these materials is discussed on base of comparative analyses of experimental and theoretical optical conductivity spectra. Experimental optical conductivities of the compounds are shown to conform qualitatively to spectra calculated from densities of electronic states in the region of quantum electron transitions.

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Nonlocal correlations in the optical conductivity spectra

Condensed Matter Physics ◽

10.5488/cmp.21.23702 ◽

2018 ◽

Vol 21 (2) ◽

pp. 23702

Author(s):

Dobushovskyi ◽

Shvaika

Keyword(s):

Optical Conductivity ◽

Nonlocal Correlations ◽

Conductivity Spectra

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Электронная структура и оптические спектры соединений GdFeAl и GdFeSi

Физика твердого тела ◽

10.21883/ftt.2021.06.50925.019 ◽

2021 ◽

Vol 63 (6) ◽

pp. 700

Author(s):

Ю.В. Князев ◽

А.В. Лукоянов ◽

Ю.И. Кузьмин ◽

А.Г. Кучин ◽

С.П. Платонов

Keyword(s):

Optical Properties ◽

Electronic Structure ◽

Comparative Analysis ◽

Optical Conductivity ◽

Electronic States ◽

Wavelength Interval ◽

Correlation Effects ◽

Calculated Density ◽

Density Of Electronic States ◽

Conductivity Spectra

Results of investigations of electronic structure and optical properties of GdFeAl and GdFeSi compounds are presented. Spin-plarized density of states and interband optical conductivity spectra were calculated in frame of DFT+U technique with a correction for strong correlation effects in 4f shell of Gd. Optical properties were measured by ellipsometric technique in wavelength interval of 0.22 – 16 μm. Nature of quantum light absorption is discussed on the base of comparative analysis of experimental and calculated spectra. It is shown that main features of frequency dependencies of the optical conductivity are interpret qualitatively by the calculated density of electronic states.

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Optical conductivity spectra and electronic structure of Bi2Sr2(Y1−xCax)Cu2Oy system

Journal of Physics and Chemistry of Solids ◽

10.1016/s0022-3697(98)00253-4 ◽

1999 ◽

Vol 60 (1) ◽

pp. 41-51 ◽

Cited By ~ 7

Author(s):

Takanori Itoh ◽

Kazuo Fueki ◽

Yasumoto Tanaka ◽

Hideo lhara

Keyword(s):

Electronic Structure ◽

Optical Conductivity ◽

Conductivity Spectra

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Optical Properties and Electronic Structure of LaNi5-XCux (x=0–1.2) Intermetallic System

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.168-169.529 ◽

2010 ◽

Vol 168-169 ◽

pp. 529-532 ◽

Cited By ~ 2

Author(s):

Yu.V. Knyazev ◽

Y.I. Kuz’min ◽

A.V. Lukoyanov ◽

Anatoly G. Kuchin

Keyword(s):

Optical Properties ◽

Electronic Structure ◽

Optical Conductivity ◽

Theoretical Calculations ◽

Generalized Gradient ◽

Broad Absorption ◽

Generalized Gradient Approximation ◽

Electron Transitions ◽

Intermetallic System ◽

Conductivity Spectra

Optical properties of the LaNi5-xCux (x = 0, 0.6, 1, 1.2) compounds were studied. It was shown that substitution of copper for nickel led to noticeable changes in the optical conductivity spectra. Calculations of the electronic structure of compounds with x = 0, 1, 2 were performed using a generalized gradient approximation. The interband optical conductivity of these intermetallics was calculated. The optical ellipsometrical measurements and theoretical calculations testify to the appearance of a broad absorption structure associated with the Cu 3d  Ni 3d electron transitions and increasing with the growth of copper content.

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OPTICAL CONDUCTIVITY OF OXIDES

International Journal of Modern Physics B ◽

10.1142/s0217979205028128 ◽

2005 ◽

Vol 19 (01n03) ◽

pp. 153-157

Author(s):

FRANCOIS GERVAIS ◽

VINH TA PHUOC ◽

NATHALIE POIROT ◽

CEDRIC COQUELET ◽

GISELE GRUENER ◽

...

Keyword(s):

Charge Carrier ◽

Optical Conductivity ◽

Polarized Light ◽

Spectral Weight ◽

Charge Carrier Concentration ◽

Carrier Distribution ◽

Conducting Oxides ◽

Maximum Conductivity ◽

Electronic Concentration ◽

Conductivity Spectra

Optical conductivity spectra of conducting oxides including high-TC cuprates - compared to non-superconducting nickelates in particular - deduced from infrared reflectivity spectroscopy in polarized light and their doping and temperature dependence, are discussed with emphasis on the signatures of intrinsic inhomogeneities of charge carrier concentration. The model of disordered metal is shown to be compatible with the general loss of spectral weight in the optical conductivity upon decreasing frequency, instead of a maximum conductivity at zero frequency as found within a Drude description. In high-TC multilayer cuprates, the discussion focuses upon the c-axis response and the inhomogeneity of the electronic concentration related to the conducting planes alternating with insulating sheets. The onset of stripes that are intrinsic inhomogeneities of the charge carrier distribution is discussed in the example of nickelates.

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