Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Correlated Electrons: Heavy Fermions
TT 6.10: Vortrag
Montag, 25. Februar 2008, 12:00–12:15, EB 202
Low-temperature thermodynamic and magnetic properties of the geometrically frustrated Kondo lattice Pr2Ir2O7 — •Jan Guido Donath1, Philipp Gegenwart2, Satoru Nakatsuji3, and Yo Machida3 — 1Max-Planck-Institute for Chemical Physics of Solids, 01187 Dresden, Germany — 2I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 3Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581 Japan
The ground state of f-electron Kondo-lattice systems is determined by the interplay of the Kondo- and the RKKY interaction, leading to a quantum critical point separating long-range magnetic order from paramagnetism. The interesting question arises, how this situation is modified in the presence of strong magnetic frustration. Here, we focus on the iridate Pr2Ir2O7 which crystallizes in the highly frustrated pyrochlore structure and has recently been proposed as a realization of a metallic spin liquid [1]. We present low-temperature thermodynamic (specific heat and thermal expansion) and magnetic properties of slightly off-stoichiometric Pr2Ir2O7 single crystals.
[1] S. Nakatsuji et al., PRL 96, 087204 (2006)