Spin-wave excitations in finite chain segments of the diluted one-dimensional Heisenberg antiferromagnet

2000 ◽  
Vol 16 (1) ◽  
pp. 81-84 ◽  
Author(s):  
A. Furrer ◽  
H.-U. Güdel
Keyword(s):  
Spin Wave ◽  
Heisenberg Antiferromagnet ◽  
Finite Chain ◽  
One Dimensional ◽  
Spin Wave Excitations

A neutron scattering study of spin dynamics in the one-dimensional paramagnet CsMnBr3

1984 ◽  
Vol 62 (11) ◽  
pp. 1132-1138 ◽  
Author(s):  
B. D. Gaulin ◽  
M. F. Collins
Keyword(s):  
Neutron Scattering ◽  
Spin Wave ◽  
Spin Dynamics ◽  
Quantitative Agreement ◽  
Generalized Langevin Equation ◽  
Heisenberg Antiferromagnet ◽  
One Dimensional ◽  
Truncation Scheme ◽  
Zone Centre ◽  
The One

CsMnBr3 is a quasi-one-dimensional Heisenberg antiferromagnet. We present results of the magnetic inelastic response of CsMnBr3 across the magnetic Brillouin zone by neutron scattering techniques. Well-defined spin-wave modes, characteristic of one-dimensional magnetic insulators, are found over most of the zone in the paramagnetic phase at 15 K. The zone centre response is not sharp, but peaks in the scattering function S(k, ω) are found. No excitation branch going to zero energy at zero wavevector is found. At small wavevectors there is a mode with energy 1.7 ± 0.2 meV and we use it to identify planar anisotropy in this system. The mid-zone response as a function of temperature is analyzed in terms of a generalized Langevin equation approach (Mori formulation) to the dynamics of the one-dimensional Heisenberg antiferromagnet. The theory contains no adjustable parameters. Our results are compared with two truncation schemes of the theory. We report qualitative agreement with the theories, including the observation of upwards renormalization of spin-wave energy with temperature. Quantitative agreement is less than good for either truncation scheme.

Spin-Wave Excitations and Energy Gap in Quasi-One-Dimensional Organic Polymer Ferromagnets

1996 ◽  
Vol 26 (1) ◽  
pp. 117-120 ◽  
Author(s):  
Zhong Fang ◽  
Yu-qin Wang ◽  
Zu-Li Liu ◽  
Kai-Lun Yao
Keyword(s):  
Spin Wave ◽  
Energy Gap ◽  
Organic Polymer ◽  
One Dimensional ◽  
Spin Wave Excitations

scholarly journals NEAR-BOUNDARY AND BULK REGIONS OF A SEMI-INFINITE TWO-DIMENSIONAL HEISENBERG ANTIFERROMAGNET

2010 ◽  
Vol 24 (22) ◽  
pp. 2327-2334 ◽  
Author(s):  
N. VOROPAJEVA ◽  
A. SHERMAN
Keyword(s):  
Spin Wave ◽  
Nearest Neighbor ◽  
Spin Waves ◽  
Two Dimensional ◽  
Heisenberg Antiferromagnet ◽  
Elementary Excitations ◽  
Spin Correlations ◽  
One Dimensional ◽  
Wave Approximation

Using the spin-wave approximation elementary excitations of a semi-infinite two-dimensional S = ½ Heisenberg antiferromagnet are considered. The spectrum consists of bulk modes — standing spin waves and a quasi-one-dimensional mode of boundary spin waves. These latter excitations eject bulk modes from two boundary rows of sites, thereby dividing the antiferromagnet into two regions with different dominant excitations. As a result, absolute values of nearest-neighbor spin correlations on the edge exceed the bulk value.

Spin wave excitations in frustrated one-dimensional antiferromagnets KCu1 −cMncF3

1995 ◽  
Vol 213-214 ◽  
pp. 179-181
Author(s):  
Y. Todate ◽  
H. Ikeda ◽  
K. Tajima ◽  
K. Hirakawa
Keyword(s):  
Spin Wave ◽  
One Dimensional ◽  
Spin Wave Excitations

Spin-wave excitations in ferromagnetic nanotubes

2006 ◽  
Vol 600 (18) ◽  
pp. 4151-4154 ◽  
Author(s):  
T.M. Nguyen ◽  
M.G. Cottam
Keyword(s):  
Spin Wave ◽  
Spin Wave Excitations ◽  
Ferromagnetic Nanotubes
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