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E. Bauer, H. Kaldarar, R. Khan, H. Michor, T. Muramatsu, T. Kanemase, T. Kagayama, K. Shimizu, M. Giovannini:
"Magnetic ordering in Yb compounds: evidence for two quantum critical points in Yb₂Pd₂Sn";
Vortrag: International Workshop on Exotic States in Materials with Strongly Correlated Electrons, Sinaia, Romania (eingeladen); 07.09.2007 - 10.09.2007.

Abstract:
Ternary RE₂Pd₂In compounds with RE = rare earth exhibit various types of magnetic order and crystalline electric field splitting plays a crucial role determining the ground state of a particular rare earth element in such compounds. Kondo interaction was found as principal mechanism in Ce₂Pd₂In and magnetic order occurs with substantially reduced magnetic moments. The type of order, however, depends critically on slight changes in stoichiometry. On the contrary, long range magnetic order is absent in isomorphous Yb₂Pd₂In, which can be considered as the hole-analogue of Ce₂Pd₂In. A preliminary study on isostructural Yb₂Pd₂Sn evidences a nonmagnetic ground state as well, at least down to 100 mK. The aim of the present work is to show that long range magnetic order is established on an In/Sn substitution, but constrained to a narrow region of concentrations rich in Sn. This observation implies that Yb₂Pd₂(In,Sn) may possess two quantum critical points (QCP) and non-Fermi-liquid features should be evident around each QCP. We also discuss a scenario to find for the first time two quantum critical points in a single material. (Work supported by the Austrian FWF, P18054).