Partial magnetic order in the itinerant-electron magnet MnSi |
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Authors: | L Pintschovius D Reznik C Pfleiderer H v Löhneysen |
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Institution: | 1.Forschungszentrum Karlsruhe, IFP,Karlsruhe,Germany;2.Laboratoire Léon Brillouin,CE-Saclay,Gif-sur-Yvette Cedex,France;3.Physikalisches Institut,Universit?t Karlsruhe,Germany |
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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. |
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Keywords: | High pressure Magnetic phase diagram Helical order |
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