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      https://www.ias.ac.in/article/fulltext/pram/063/01/0117-0123

    • Keywords

       

      High pressure; Magnetic phase diagram; Helical order

    • Abstract

       

      MnSi is an itinerant ferromagnet with a long-wavelength helical modulation of the spin structure. Macroscopic measurements suggest that the ordering temperatureTc is reduced with increasing pressure fromTc = 30 K atp = 0 to zero at the critical pressurepc = 14.6 kbar. Resistivity measurements show that MnSi enters a non-Fermi liquid state atpc, which remains to be understood. Neutron scattering techniques have been used to investigate the magnetic structure at and abovepc, i.e. triple-axis spectrometry and small angle neutron scattering. Surprisingly, sizeable quasi-static moments were found to survive to pressures considerably abovepc. 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.

    • Author Affiliations

       

      L Pintschovius1 D Reznik1 2 C Pfleiderer3 H v Löhneysen1 3

      1. Forschungszentrum Karlsruhe, IFP, P.O. Box 3640, Karlsruhe - D-76021, Germany
      2. Laboratoire Léon Brillouin, CE-Saclay, Gif-sur-Yvette Cedex - F-91911, France
      3. Physikalisches Institut, UniversitÄt Karlsruhe, Germany
    • Dates

       
  • Pramana – Journal of Physics | News

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