Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 10: FV-internes Symposium ”Quantum Phase Transitions”
TT 10.3: Fachvortrag
Dienstag, 9. März 2004, 11:05–11:35, H18
Non-Fermi-Liquid Phase of a Pure Itinerant-Electron Magnet — •C. Pfleiderer — Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsuhe
Extensive studies of the itinerant-electron magnetism in the cubic transition metal compound MnSi as function of pressure are reviewed, that suggest a distinct transition from a weakly spin polarized Fermi liquid ground state to a non-Fermi liquid (NFL) phase of exceptional stability above pc=14.6 kbar [1,2]. In a recent neutron diffraction experiment [3] sizable quasi-static magnetic moments have been found to exist far into this NFL phase. These moments are organized in a highly unusual pattern never seen before, yielding Bragg intensity on the surface of a tiny sphere in reciprocal space implying partial order. The properties of MnSi shed new light on the possible nature of inconsistencies of the metallic state near magnetic quantum phase transitions observed in numerous itinerant-electron magnets. In particular, they support the genuine existence of metallic phases with partial order of the conduction electrons, that are reminiscent of liquid crystals, as proposed for the high-Tc cuprates and heavy-fermion compounds.
[1] C. Pfleiderer et al., Nature 414 (2001) 427.
[2] N. Doiron-Leyraud et al. Nature 425 (2003) 595.
[3] C. Pfleiderer et al., Nature in print. *in collaboration with J. Flouquet, M. Garst, S. R. Julian, H. v. Löhneysen, G. G. Lonzarich, L. Pintschovius, D. Reznik, A. Rosch, A. N. Stepanov, C. Thessieu and M. Uhlarz.
11:35 Pause