Spin-wave measurements on hexagonal MnTe of NiAs-type structure by inelastic neutron scattering

Journal Article · Wed Mar 01 04:00:00 EST 2006 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.73.1· OSTI ID:20787994

Szuszkiewicz, W; Dynowska, E; Witkowska, B; Hennion, B ^[1]

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1. Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw (Poland)

MnTe with a hexagonal structure of NiAs type is an antiferromagnetic semiconductor below the Neel temperature T{sub N}=310 K. The spin-wave excitations of a MnTe single crystal have been measured at T=11 K by inelastic neutron scattering. The experimental spin-wave dispersions, obtained along five high-symmetry directions of the reciprocal space, have been modeled with a Heisenberg Hamiltonian including isotropic exchanges up to the third nearest neighbors and a planar magnetic anisotropy. This yielded the exchange integral values J{sub 1}=-21.5 K, J{sub 2}=0.67 K, and J{sub 3}=-2.87 K. These results are presented and compared to experimental values of relevant diluted magnetic semiconductors, allowing a discussion on a generic description of the distance dependence of the nearest-neighbor magnetic interactions.

• OSTI ID: 20787994
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 10 Vol. 73; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
DISTANCE
EXCITATION
HAMILTONIANS
HEISENBERG MODEL
INELASTIC SCATTERING
MAGNETIC SEMICONDUCTORS
MANGANESE TELLURIDES
MONOCRYSTALS
NEEL TEMPERATURE
NEUTRON DIFFRACTION
SPIN WAVES
SYMMETRY