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Pramana

, Volume 63, Issue 1, pp 117–123 | Cite as

Partial magnetic order in the itinerant-electron magnet MnSi

  • L. Pintschovius
  • D. Reznik
  • C. Pfleiderer
  • H. v Löhneysen
Article

Abstract

MnSi is an itinerant ferromagnet with a long-wavelength helical modulation of the spin structure. Macroscopic measurements suggest that the ordering temperatureT c is reduced with increasing pressure fromT c = 30 K atp = 0 to zero at the critical pressurep c = 14.6 kbar. Resistivity measurements show that MnSi enters a non-Fermi liquid state atp c, which remains to be understood. Neutron scattering techniques have been used to investigate the magnetic structure at and abovep c, i.e. triple-axis spectrometry and small angle neutron scattering. Surprisingly, sizeable quasi-static moments were found to survive to pressures considerably abovep c. They are, however, organized in a highly unusual way such that the magnetic Bragg reflections are sharp in the longitudinal direction but are very broad in the transverse direction, implying a partial magnetic order that was never seen before.

Keywords

High pressure Magnetic phase diagram Helical order 

PACS Nos

75.25.+z 75.40.-s 

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Copyright information

© Indian Academy of Sciences 2004

Authors and Affiliations

  • L. Pintschovius
    • 1
  • D. Reznik
    • 1
    • 2
  • C. Pfleiderer
    • 3
  • H. v Löhneysen
    • 1
    • 3
  1. 1.Forschungszentrum Karlsruhe, IFPKarlsruheGermany
  2. 2.Laboratoire Léon BrillouinCE-SaclayGif-sur-Yvette CedexFrance
  3. 3.Physikalisches InstitutUniversitÄt KarlsruheGermany

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