Spin dynamics in the diluted three‐dimensional classical Heisenberg antiferromagnet

1993 ◽  
Vol 73 (10) ◽  
pp. 5645-5647 ◽  
Author(s):  
Kun Chen ◽  
D. P. Landau
Keyword(s):  
Spin Dynamics ◽  
Three Dimensional ◽  
Heisenberg Antiferromagnet

scholarly journals Structure Solution of Nano-Crystalline Small Molecules Using MicroED and Solid-State NMR Dipolar-Based Experiments

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4652
Author(s):  
Nghia Tuan Duong ◽  
Yoshitaka Aoyama ◽  
Katsumi Kawamoto ◽  
Toshio Yamazaki ◽  
Yusuke Nishiyama
Keyword(s):  
Spin Dynamics ◽  
Double Resonance ◽  
Three Dimensional ◽  
Saturation Pulse ◽  
X Ray Crystallography ◽  
Nano Crystalline ◽  
Structure Solution ◽  
Validation Procedure ◽  
R Factors ◽  
Shift Calculation

Three-dimensional electron diffraction crystallography (microED) can solve structures of sub-micrometer crystals, which are too small for single crystal X-ray crystallography. However, R factors for the microED-based structures are generally high because of dynamic scattering. That means R factor may not be reliable provided that kinetic analysis is used. Consequently, there remains ambiguity to locate hydrogens and to assign nuclei with close atomic numbers, like carbon, nitrogen, and oxygen. Herein, we employed microED and ssNMR dipolar-based experiments together with spin dynamics numerical simulations. The NMR dipolar-based experiments were 1H-14N phase-modulated rotational-echo saturation-pulse double-resonance (PM-S-RESPDOR) and 1H-1H selective recoupling of proton (SERP) experiments. The former examined the dephasing effect of a specific 1H resonance under multiple 1H-14N dipolar couplings. The latter examined the selective polarization transfer between a 1H-1H pair. The structure was solved by microED and then validated by evaluating the agreement between experimental and calculated dipolar-based NMR results. As the measurements were performed on 1H and 14N, the method can be employed for natural abundance samples. Furthermore, the whole validation procedure was conducted at 293 K unlike widely used chemical shift calculation at 0 K using the GIPAW method. This combined method was demonstrated on monoclinic l-histidine.

scholarly journals Quantum effects in the spin dynamics of the linear Heisenberg antiferromagnet

1979 ◽  
Vol 50 (B11) ◽  
pp. 7404 ◽  
Author(s):  
Gerhard Müller ◽  
Hans Beck ◽  
Jill C. Bonnerb
Keyword(s):  
Spin Dynamics ◽  
Quantum Effects ◽  
Heisenberg Antiferromagnet

An unified view of the spin dynamics in two- and three-dimensional magnetic systems

1999 ◽  
Vol 205 (2-3) ◽  
pp. 343-356 ◽  
Author(s):  
U. Köbler ◽  
A. Hoser ◽  
M. Kawakami ◽  
T. Chatterji ◽  
J. Rebizant
Keyword(s):  
Spin Dynamics ◽  
Three Dimensional ◽  
Magnetic Systems ◽  
Unified View

scholarly journals Coherent ultrafast spin-dynamics probed in three dimensional topological insulators

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
F. Boschini ◽  
M. Mansurova ◽  
G. Mussler ◽  
J. Kampmeier ◽  
D. Grützmacher ◽  
...  
Keyword(s):  
Topological Insulators ◽  
Spin Dynamics ◽  
Three Dimensional

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.

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