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Far-infrared and submillimeter-wave conductivity in electron-doped cuprate La_{2-x}Ce_xCuO_4
A. Pimenov, A. V. Pronin, A. Loidl +2
We performed far-infrared and submillimeter-wave conductivity experiments in the electron-doped cuprate La_{2-x}Ce_xCuO_4 with x = 0.081 (underdoped regime, T_c = 25 K). The onset…
Anisotropic Colossal Magnetoresistance Effects in Fe_{1-x}Cu_xCr_2S_4
V. Fritsch, J. Deisenhofer, R. Fichtl +9
A detailed study of the electronic transport and magnetic properties of FeCuCrS () on single crystals is presented. The resistivity is investigated…
'Boson peak' and high-frequency excitations in glassy crystals
P. Lunkenheimer, A. Loidl
The high-frequency excitations in glasses and supercooled liquids belong to the great mysteries of the physics of condensed matter. While the fast process, located at GHz-THz, can…
Magnetic Anisotropy in La_0.8Sr_0.2MnO_3: Electron Spin Resonance
J. Deisenhofer, H. -A. Krug von Nidda, A. Loidl +4
We report on Ferromagnetic-Resonance experiments in a single crystal of La_0.8Sr_0.2MnO_3 in the temperature range from 4 to 300 K. The observed anisotropy of the resonance line ch…
Interplay of superexchange and orbital degeneracy in Cr-doped LaMnO3
Joachim Deisenhofer, Michalis Paraskevopoulos, Hans-Albrecht Krug von Nidda +1
We report on structural, magnetic and Electron Spin Resonance (ESR) investigations in the manganite system LaMn_{1-x}Cr_{x}O_{3} (x<=0.5). Upon Cr-doping we observe a reduction of…
Electronic and optical properties of LiBC
A. V. Pronin, K. Pucher, P. Lunkenheimer +2
LiBC, a semiconducting ternary borocarbide constituted of the lightest elements only, has been synthesized and characterized by x-ray powder diffraction, dielectric spectroscopy, a…
LiBC by polarized Raman spectroscopy: Evidence for lower crystal symmetry ?
J. Hlinka, I. Gregora, J. Pokorny +2
The paper presents polarized Raman scattering study on a few-micron-size crystallite of LiBC with natural faces. The experiment on as grown sample has revealed a four lattice modes…
Photoemission study of polycrystalline Gd_{1-x}Sr_xTiO_{3+delta}: correlation and surface effects
M. Sing, M. Karlsson, D. Schrupp +6
We report photoemission studies of polycrystalline samples of Sr-doped GdTiO_{3+delta}, which undergoes a Mott-Hubbard-like metal-insulator transition at a Ti-concentration of abou…
An unusual interplay among disorder, Kondo-effect and spin-glass behavior in the Kondo lattices, CeAuCoSi
Subham Majumdar, E. V. Sampathkumaran, St. Berger +6
We report the results of magnetic measurements for the solid solution CeAuCoSi. The results reveal that this solid solution is characterized by a magnetic phase…
Materials with Colossal Dielectric Constant: Do They Exist?
P. Lunkenheimer, V. Bobnar, A. V. Pronin +3
Experimental evidence is provided that colossal dielectric constants, epsilon >= 1000, sometimes reported to exist in a broad temperature range, can often be explained by Maxwell-W…