Partial order in the non-Fermi-liquid phase of MnSi

C. Pfleiderer (), D. Reznik, L. Pintschovius, H. v. Löhneysen, M. Garst and A. Rosch
Additional contact information
C. Pfleiderer: Universität Karlsruhe
D. Reznik: Institut für Festkörperphysik
L. Pintschovius: Institut für Festkörperphysik
H. v. Löhneysen: Universität Karlsruhe
M. Garst: Universität Karlsruhe
A. Rosch: Universität Karlsruhe

Nature, 2004, vol. 427, issue 6971, 227-231

Abstract: Abstract Only a few metallic phases have been identified in pure crystalline materials. These include normal, ferromagnetic and antiferromagnetic metals, systems with spin and charge density wave order, and superconductors. Fermi-liquid theory provides a basis for the description of all of these phases. It has been suggested that non-Fermi-liquid phases of metals may exist in some heavy-fermion compounds1,2 and oxide materials3,4,5,6, but the discovery of a characteristic microscopic signature of such phases presents a major challenge. The transition-metal compound MnSi above a certain pressure (pc = 14.6 kbar) provides what may be the cleanest example of an extended non-Fermi-liquid phase in a three-dimensional metal7,8,9. The bulk properties of MnSi suggest that long-range magnetic order is suppressed at pc (refs 7–12). Here we report neutron diffraction measurements of MnSi, revealing that sizeable quasi-static magnetic moments survive far into the non-Fermi-liquid phase. These moments are organized in an unusual pattern with partial long-range order. Our observation supports the existence of novel metallic phases with partial ordering of the conduction electrons (reminiscent of liquid crystals), as proposed for the high-temperature superconductors4,5,6 and heavy-fermion compounds13.

Date: 2004
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DOI: 10.1038/nature02232

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