Author: Elisa Maria da Silva WheelerPublisher:
ISBN:
Category : Antiferromagnetism
Languages : en
Pages : 0
Book Description
Neutron Scattering from Low-dimensional Quantum Magnets
Author: Elisa Maria da Silva WheelerPublisher:
ISBN:
Category : Antiferromagnetism
Languages : en
Pages : 0
Book Description
Neutron Scattering Studies on Low-dimensional Quantum Magnets
Author: Chiron Jeeb MukherjeePublisher:
ISBN:
Category : Antiferromagnetism
Languages : en
Pages : 418
Book Description
Neutron Scattering Studies of Low-dimensional Quantum Magnets
Author: David MacdougalNeutron and Resonant X-ray Scattering Studies of Low Dimensional Quantum Magnets
Author: Neutron Scattering Investigations of Zero- and One-dimensional Quantum Magnets
Author: Oliver PieperPublisher:
ISBN: 9783832527303
Category :
Languages : en
Pages : 270
Book Description
This thesis deals with the investigation of two different types of low-dimensional quantum magnets using the technique of neutron scattering.In the first part, the magnetic properties of three Mn_6-based single molecule magnets are explored by means of inelastic neutron scattering. The experimental data reveal that small structural distortions of the molecular geometry produce a significant effect on the energy level diagram and therefore on the magnetic properties of the molecules. It will be shown that the giant spin model completely fails to describe the spin level structure of the ground spin multiplets and that the excited S-multiplets play a key role in determining the effective energy barrier for the magnetization reversal.The second part of this thesis presents an in-depth study of the nuclear and magnetic properties of the quasi-one-dimensional Heisenberg antiferromagnet CaV_2O_4. The magnetism in this system arises from the partially filled t_{2g-levels of the V^{3+-ions, which in addition give an orbital degree of freedom to the system.Single crystal and powder neutron diffraction as well as neutron spectroscopy are used to determine the nuclear and magnetic structure as well as the complex excitation spectrum of CaV_2O_4. The results are analysed theoretically and from this the leading exchange paths are deduced and discussed in terms of orbital ordering.
Neutron Scattering Studies of Low-dimensional Quantum Spin Systems
Author: S. P. GosulyNeutron Scattering Studies of Low-dimensional Quantum Spin Systems
Author: Stefan Paul GosulyNeutron Scattering Studies of Low-dimensional Quantum Spin Systems
Author: Nikolay TsyrulinStatics and Dynamics of Weakly Coupled Antiferromagnetic Spin-1/2 Ladders in a Magnetic Field
Author: Pierre BouillotPublisher: Springer Science & Business Media
ISBN: 3642338089
Category : Computers
Languages : en
Pages : 104
Book Description
This thesis shows how a combination of analytic and numerical techniques, such as a time dependent and finite temperature Density Matrix Renormalization Group (DMRG) technique, can be used to obtain the physical properties of low dimensional quantum magnets with an unprecedented level of accuracy. A comparison between the theory and experiment then enables these systems to be used as quantum simulators; for example, to test various generic properties of low dimensional systems such as Luttinger liquid physics, the paradigm of one dimensional interacting quantum systems. Application of these techniques to a material made of weakly coupled ladders (BPCB) allowed the first quantitative test of Luttinger liquids. In addition, other physical quantities (magnetization, specific heat etc.), and more remarkably the spins-spin correlations – directly measurable in neutron scattering experiments – were in excellent agreement with the observed quantities. We thus now have tools to quantitatiively assess the dynamics for this class of quantum systems.
INTERACTING QUANTUM SPIN CHAINS.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A brief review of recent advances in neutron scattering studies of low-dimensional quantum magnets is followed by a particular example. The separation of single-particle and continuum states in the weakly-coupled S = l/2 chains system BaCu2Si2O-- is described in some detail.