Critical fluctuations in MnSi near TC : A polarized neutron scattering study

Details Critical fluctuations in MnSi near TC : A polarized neutron scattering study Critical fluctuations in MnSi near TC : A polarized neutron scattering study

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvb..72m4420g&link_type=abstract

Physical Review B, vol. 72, Issue 13, id. 134420

Physics

35

Critical-Point Effects, Specific Heats, Short-Range Order, Neutron Scattering

Scientific paper

Results of polarized neutron small angle scattering in MnSi, a cubic itinerant magnet, near Tc =28.8 K are presented and analyzed. The diffuse scattering intensity looks like half-moons oriented along the incident neutron polarization. The sum of the intensities for two opposite polarizations form an anisotropic ring with weak spots, which below Tc transform into the Bragg peaks originating from the helical structure. These results are in semiquantitative agreement with the mean-field calculations based on the Bak-Jensen model that takes into account the hierarchy of the interactions: the exchange interaction, the isotropic Dzyaloshinskii-Moriya (DM) interaction and the weak anisotropic exchange (AE) interaction. The DM interaction is responsible for the scattering intensity concentrated in the half-moons. The AE interaction provides the anisotropy so that the correlation length diverges along [111] only. The corresponding critical exponent is ν=0.62 (1) . The exponent of the Bragg intensity due to the helical structure at T< Tc is 2β=0.44 (1) where β is the exponent of the helix magnetization.

Affiliated with

Also associated with

No associations

Rating

Critical fluctuations in MnSi near TC : A polarized neutron scattering study does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Critical fluctuations in MnSi near TC : A polarized neutron scattering study, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Critical fluctuations in MnSi near TC : A polarized neutron scattering study will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1657158