Inelastic Neutron Scattering in γ-Mn(12%Ge) Alloy Above and Below the Néel Temperature

• Authors: J. Jankowska-Kisielińska , K. Mikke , B. Hennion
• Languages of publication: EN

Abstracts

EN

The magnetic excitations different from spin waves in the γ-Mn(12%Ge) antiferromagnet are the subject of the present investigation. The inelastic neutron scattering was measured at 4 temperatures above T_{N}. The Lorentzian-type formula for the inelastic neutron scattering cross-section with the spectral width for a hydrodynamic region was used for data analysis. The obtained values of the "stiffness constants" are of the order of 200 meV Å and they depend weakly on temperature in the range of 1.04-1.25T_{N}. The inelastic neutron scattering for energy transfers below and close to the value of the gap energy of the spin wave spectrum was measured at room temperature. The observed intensities can be treated as a sum of intensities of neutrons scattered on spin waves around the magnetic Brillouin zone centre and = those scattered on fluctuations at the zone boundary.

Keywords

EN

75.40.Gb; 75.30.Ds; 75.20.En

Discipline

• 75.30.Ds: Spin waves(for spin-wave resonance, see 76.50.+g)
• 75.40.Gb: Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
• 75.20.En: Metals and alloys

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2000
• Volume: 97
• Issue: 3
• Pages: 559-562

Dates

published

2000-03

Contributors

author

J. Jankowska-Kisielińska

• Institute of Atomic Energy, Świerk, 05-400 Otwock, Poland

author

K. Mikke

• Institute of Atomic Energy, Świerk, 05-400 Otwock, Poland

author

B. Hennion

• Laboratoire Lèon Brillouin, CEN Saclay, France

Identifiers

DOI

10.12693/APhysPolA.97.559