Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 34: Correlated Electrons: Metal-Insulator Transition 2

TT 34.16: Talk

Thursday, February 28, 2008, 18:15–18:30, H 2053

Hg₂Ru₂O₇, a New Magnetic Pyrochlore Showing a Metal-Insulator Transition — •Reinhard K. Kremer, Jun Sung Kim, Wilhelm Klein, and Martin Jansen — Max Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany

The new pyrochlore compound Hg₂Ru₂O₇ was prepared under elevated oxygen pressure and characterized by x-ray diffraction, magnetic susceptibility, heat capacity, electrical resistivity and Hall effect measurements. Hg₂Ru₂O₇ undergoes a simultaneous metal-insulator and antiferromagnetic ordering transition at ∼108 K with the critical temperature decreasing under hydrostatic pressure.[1] Hg₂Ru₂O₇ is compared with other p-block metal oxoruthenates with pyrochlore structure which qualitatively show a very similar behavior. General trends are discussed.

[1] W. Klein, R. K. Kremer and M. Jansen, J. Mater. Chem. 17, 1356 (2007).