K. Bärner
University of Göttingen
5 Papers
53 Citations
K. Bärner is an academic researcher from University of Göttingen. The author has contributed to research in topics: Antiferromagnetism & Absorption edge. The author has an hindex of 4, co-authored 5 publications.
Chat about Author
Papers
Magnetic interaction in Mg, Ti, Nb doped manganites
TL;DR: In this paper, the effect of Mn substitution with Me=Mg2+, Ti4+, Nb5+ in manganites has been investigated by preparing La0.7Sr0.3(Mn 1-xMex)O3 and La1-xSrx(mn 1 - x/2Nbx/2).
57
Metamagnetism in the Cr2V4-xMoxO13+0.5x solid solutions.
T Gron,Józef Krok-Kowalski,Henryk Duda,T. Mydlarz,A. Gilewski,J. Walczak,E. Filipek,K. Bärner +7 more
TL;DR: In this article, the temperature range 4.2 -300 K and the paramagnetic Curie-Weiss temperature was established for all samples with x = 0.5 in stationary magnetic fields up to 14 T and up to 38 T on polycrystalline solid solutions.
24
Transport processes in the insulating solid solutions of Cr2V4-xMoxO13+0.5x
TL;DR: In this article, the electrical resistivity, the Seebeck effect and the UV/VIS absorption were carried out in the solid solutions under study, and it was observed that with the increase of temperature the activation energy changes rapidly for all samples, at about 700 K a phase transition from insulating to semiconducting state takes place, the shift of the absorption edge to higher wavelengths is explained by the d-d electron transitions between the chromium ions with the valence state 3+ and 2+.
2
Antiferromagnet-ferromagnet and structural phase transitions in La 0.88 MnO x manganites
TL;DR: In this paper, the crystal and magnetic properties of manganites have been investigated as a function of oxygen content by x-ray, neutron diffraction, Young's modulus, magnetization, and resistivity measurements.
Electrical and optical properties of AVO4 (A = Fe, Cr, Al) compounds
T. Gro,Henryk Duda,Józef Krok-Kowalski,J. Walczak,E. Filipek,P. Tabero,A. Wyrostek,K. Bärner +7 more
TL;DR: In this article, the electrical resistivity, the Seebeck effect and the UV/VIS absorption were measured for samples of AVO4 (A = Fe, Cr, Al) compounds, and it was observed that chromium and aluminum vanadates are insulators at room temperature and they have p and n-type electrical conductivity at higher temperatures.