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Science 29 June 2007:
Vol. 316. no. 5833, pp. 1871 - 1874
DOI: 10.1126/science.1142644
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Reports

Non-Fermi Liquid Metal Without Quantum Criticality

C. Pfleiderer,1* P. Böni,1 T. Keller,2,3 U. K. Rößler,4 A. Rosch5

A key question in condensed matter physics concerns whether pure three-dimensional metals can always be described as Fermi liquids. Using neutron Larmor diffraction to overcome the traditional resolution limit of diffraction experiments, we studied the lattice constants of the cubic itinerant-electron magnet manganese silicide (MnSi) at low temperatures and high pressures. We were able to resolve the nature of the phase diagram of MnSi and to establish that a stable, extended non–Fermi liquid state emerges under applied pressure without quantum criticality. This suggests that new forms of quantum order may be expected even far from quantum phase transitions.

1 Physik-Department E21, Technische Universität München, D-85748 Garching, Germany.
2 Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany.
3 Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universität München, D-85748 Garching, Germany.
4 Leibniz-Institut für Festkörper-und Werkstoffforschung (IFW) Dresden, P.O. Box 270116, D-01171 Dresden, Germany.
5 Institute of Theoretical Physics, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany.

* To whom correspondence should be addressed. E-mail: christian.pfleiderer{at}frm2.tum.de

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Skyrmion Lattice in a Chiral Magnet.
S. Muhlbauer, B. Binz, F. Jonietz, C. Pfleiderer, A. Rosch, A. Neubauer, R. Georgii, and P. Boni (2009)
Science 323, 915-919
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