Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 27: CE: Poster Session
TT 27.34: Poster
Mittwoch, 24. März 2010, 14:00–18:00, Poster D1
Magnetic and electronic properties in Chromates RCrO3 and the Vanadate K2V8O16 (Hollandite) — •A. C. Komarek1,2, M. Isobe3, T. Möller1, M. Hoelzel4,5, A. Senyshyn4,5, D. Trots6, M. T. Fernandez-Diaz7, T. Hansen7, M. Azuma8, Y. Ueda3, J. Hemberger1, T. Unruh5, J. R. Stewart7,9, M. Grüninger1, D. I. Khomskii1, and M. Braden1 — 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany — 2TU München, Physics Departement E21, D-85748 Garching, Germany — 3Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan — 4Technische Universität Darmstadt, Material und Geowissenschaften, Petersenstrasse 23, D-64287 Darmstadt, Germany — 5TU München, FRM-II, Lichtenbergstr. 1, D-85747 Garching, Germany — 6Hasylab/DESY, Notkestr. 85, D-22607 Hamburg, Germany — 7Institut Laue-Langevin, 38042 Grenoble, France — 8Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan — 9ISIS facility, Rutherford Appleton Laboratories, STFC, Chilton, Didcot OX11 0DE, UK
CaCrO3 is a 3d2 transition metal oxide with perovskite structure. Regarding the magnetism in such correlated electron systems, ferromagnetism usually comes along with metallic and antiferromagnetism (AFM) with insulating properties. Due to our neutron and optical measurements CaCrO3 seems to be a rare example of a fully 3-dim. AFM transition metal oxide. K2V8O16 is a mixed-valent vanadium oxide which exhibits a MI-transition at 160 K. Below TMI we found a strong dimerization resembling on the monoclinic M2-phase in VO2.