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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 26: CE: Heavy Fermions

TT 26.4: Talk

Wednesday, March 24, 2010, 14:45–15:00, H21

Electronic structure and thermodynamic properties of Ce3+xRh4Sn13−x. — •Monika Gamza1,2, Walter Schnelle1, Roman Gumeniuk1, Michael Nicklas1, Ulrich Burkhardt1, Andrzej Slebarski3, Lev Akselrud4, and Helge Rosner11MPI CPfS, Dresden, Germany — 2Institute of Materials Science, University of Silesia, Katowice, Poland — 3Institute of Physics, University of Silesia, Katowice, Poland — 4Ivan Franko National University of Lviv, Ukraine

    Recently we reported on the electronic structure and the magnetic properties of the strongly correlated compound Ce3Rh4Sn13 [1]. The combined theoretical and experimental study indicated an unusual sensitivity of the magnetic ground state on the local composition. This prompted us to inspect the homogeneity range of Ce and Sn in this system.

Here, we present the results of magnetization, resistivity and specific heat measurements on the series of compounds Ce3+xRh4Sn13+x (0 ≤ x ≤ 0.6) for temperatures down to 350 mK and in applied magnetic fields up to 7 T. The experimental study is accompanied by first principles electronic structure calculations. The changes in electronic structure and ground state properties for the series of Ce3+xRh4Sn13+x are analysed with respect to the substitution of Sn by Ce. Furthermore, the crystal structure of the parent compound Ce3Rh4Sn13 has been reinvestigated in detail. Superstructure has been found.

[1] Gamza M et al., J. Phys.: Condens. Matter 20 395208 (2008)

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