Analysis of low-temperature spin dynamics in a diluted Heisenberg antiferromagnet on A h.c.p. lattice: Zn1-xMnxSe

D. Zhao; D. L. Huber; T. M. Giebultowicz; J. A. Fernandez-Baca

doi:10.1016/0038-1098(94)00620-2

Analysis of low-temperature spin dynamics in a diluted Heisenberg antiferromagnet on A h.c.p. lattice: Zn_1-xMn_xSe

D. Zhao, D. L. Huber, T. M. Giebultowicz, J. A. Fernandez-Baca

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Abstract

An approximate theory of the low-temperature spin dynamics in the h.c.p. (wurtzite) phase of the diluted magnetic semiconductor Zn_1-xMn_xSe is outlined. The approach is based on an analysis of the spin wave dispersion in hcp system with Type III antiferromagnetic long range order. By taking a hexagonal average of the spin wave frequency, an approximate expression is obtained for the position of the one-magnon peak in the inelastic neutron scattering spectrum in the presence of short range Type III order. Estimates of the nearest and next-nearest neighbor exchange integrals are obtained by fitting the measured peak positions to the formula. A preliminary analysis of the data from two k points taken from a sample with x = 0.55 indicates that the nearest-neighbor exchange integral takes on a value similar to that in the light doped f.c.c. (zinc blende) phase.

Original language	English
Pages (from-to)	89-91
Number of pages	3
Journal	Solid State Communications
Volume	93
Issue number	1
DOIs	https://doi.org/10.1016/0038-1098(94)00620-2
State	Published - Jan 1995

Funding

Acknowledgeme-n-t sR esearchsu pporteidn part by the National Science Foundation under the CooperativeA greementD MR-9212658and the grant DMR-9121353.T he work at Oak Ridge National Laboratoryw as supportedb y US DOE underc ontractD E-AC05-84OR2 1400w ith Martin MariettaE nergyS ystemsI,n c.

Funders	Funder number
National Science Foundation	DMR-9121353

Keywords

disordered systems, semiconductors, spin glasses
neutron scattering
spin dynamics

Access to Document

10.1016/0038-1098(94)00620-2

Cite this

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title = "Analysis of low-temperature spin dynamics in a diluted Heisenberg antiferromagnet on A h.c.p. lattice: Zn1-xMnxSe",

abstract = "An approximate theory of the low-temperature spin dynamics in the h.c.p. (wurtzite) phase of the diluted magnetic semiconductor Zn1-xMnxSe is outlined. The approach is based on an analysis of the spin wave dispersion in hcp system with Type III antiferromagnetic long range order. By taking a hexagonal average of the spin wave frequency, an approximate expression is obtained for the position of the one-magnon peak in the inelastic neutron scattering spectrum in the presence of short range Type III order. Estimates of the nearest and next-nearest neighbor exchange integrals are obtained by fitting the measured peak positions to the formula. A preliminary analysis of the data from two k points taken from a sample with x = 0.55 indicates that the nearest-neighbor exchange integral takes on a value similar to that in the light doped f.c.c. (zinc blende) phase.",

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author = "D. Zhao and Huber, {D. L.} and Giebultowicz, {T. M.} and Fernandez-Baca, {J. A.}",

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T1 - Analysis of low-temperature spin dynamics in a diluted Heisenberg antiferromagnet on A h.c.p. lattice

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AU - Zhao, D.

AU - Huber, D. L.

AU - Giebultowicz, T. M.

AU - Fernandez-Baca, J. A.

PY - 1995/1

Y1 - 1995/1

N2 - An approximate theory of the low-temperature spin dynamics in the h.c.p. (wurtzite) phase of the diluted magnetic semiconductor Zn1-xMnxSe is outlined. The approach is based on an analysis of the spin wave dispersion in hcp system with Type III antiferromagnetic long range order. By taking a hexagonal average of the spin wave frequency, an approximate expression is obtained for the position of the one-magnon peak in the inelastic neutron scattering spectrum in the presence of short range Type III order. Estimates of the nearest and next-nearest neighbor exchange integrals are obtained by fitting the measured peak positions to the formula. A preliminary analysis of the data from two k points taken from a sample with x = 0.55 indicates that the nearest-neighbor exchange integral takes on a value similar to that in the light doped f.c.c. (zinc blende) phase.

AB - An approximate theory of the low-temperature spin dynamics in the h.c.p. (wurtzite) phase of the diluted magnetic semiconductor Zn1-xMnxSe is outlined. The approach is based on an analysis of the spin wave dispersion in hcp system with Type III antiferromagnetic long range order. By taking a hexagonal average of the spin wave frequency, an approximate expression is obtained for the position of the one-magnon peak in the inelastic neutron scattering spectrum in the presence of short range Type III order. Estimates of the nearest and next-nearest neighbor exchange integrals are obtained by fitting the measured peak positions to the formula. A preliminary analysis of the data from two k points taken from a sample with x = 0.55 indicates that the nearest-neighbor exchange integral takes on a value similar to that in the light doped f.c.c. (zinc blende) phase.

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