3 edition of Study of the 3-leg antiferromagnetic ladder using the bond-mean-field theory found in the catalog.
Study of the 3-leg antiferromagnetic ladder using the bond-mean-field theory
Kofi A. Asante
|Statement||by Kofi A. Asante.|
|Series||Canadian theses = Thèses canadiennes|
|The Physical Object|
|Pagination||xii, 103 l. :|
|Number of Pages||103|
The purpose of the hooks of a roof ladder is to _____. A) provide safe attachment points for fire fighters working on the ladder B) grip the eave of the roof to keep the ladder from slipping C) prevent the butt of the ladder from slipping or shifting D) secure the tip of the ladder to the peak of a pitched roof. Laddering allows you to tinker with your time frame Note that as each bond in your ladder matures, you would typically replace it with a bond equal to the longest maturity in your portfolio. For example, if you have a two-year, a five-year, and a ten-year bond, when the two-year bond matures, you replace it with a ten-year bond.
antiferromagnetic coupling for the complex is. In this pa-per, the broken symmetry approach within density func-tional theory (DFT-BS)[7,8] is used to investigate the anti-ferromagnetic properties of the Ag (I) complex and to study the magneto-structural correlations for the Ag (I) complex. The BS formalism is based on a broken spin and. Yeah, the m=tanhm one is what you get for the regular (ferromagnetic) Ising model, which is already not so simple, as you said, but I think it's even more complicated in the antiferromagnetic case. In the latter case, nearest neighbors have opposite spins at .
In this project, the energies and lattice constants of the ferromagnetic and antiferromagnetic states of Co, MnF2, and MnBi were found and compared. To perform these calculations, a suitable energy cutoff and k-space sampling were selected to obtain a eV tolerance, and research was done in order to determine a proper starting c/a value of. Ferroelectric ferromagnets, or multiferroics, are of significant technological interest because they combine the low power and high speed of field Cited by:
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Magnetic properties of three-leg antiferromagnetic Heisenberg spin-1/2 ladders with different dimerization patterns have been studied using the bond mean-field theory.
Our results show that rung-columnar ladders are thermodynamically stable states for large rung-to-leg coupling by: 3. The three-leg ladder with unequal J 1 –J 2 –J 1 legs. J 1, J 2 are the antiferromagnetic Heisenberg exchange integral along leg-1(3) and leg J ⊥ is the antiferromagnetic Heisenberg exchange integral along the by: 2.
Field-induced quantum (zero temperature) criticality described using parameters that are not associated with a symmetry-breaking long-range order is found in the spin- (1)/(2) antiferromagnetic three-leg Heisenberg ladder.
These parameters represent the spin bond order, which is a consequence of the probability for spins on adjacent sites to be bound in a singletlike by: 7.
The antiferromagnetic Heisenberg model on the three-leg ladder is studied using the generalized Jordan-Wigner transformation in dimensions higher than 1, and the bond-mean-field theory. In a general parameter regime, the four-chain and periodic ladders are studied using a mean-field theory based on the bond operator formalism for spin S.
The excitation spectrum and the spin gap are calculated in both the cases. The spin gap of the frustrated ladder system has a larger magnitude than in the case of nonfrustrated ladders. formal ﬁeld theory (CFT) and mean ﬁeld theory. In we present our exact numerical results for the full range of antiferromagnetic rung coupling based on the density matrix renormalization group (DMRG).
In give a sum-mary, followed by an outlook. Model system Motivated by ultracold atomic gases of alkaline-earth-like. In contrast to the previous site ED and 2-leg ladder DMRG st the KSL is found to survive only in a small corner of the phase diagram.
Instead, the NP phases occupy a Author: Hyun-Yong Lee. exchange. We show that the antiferromagnetic (AF) rung coupling destroys the long-range order and eventually makes the systems equivalent to the AF s=1/2 Heisenberg chain. We study the crossover from the weak- to strong-coupling regime by different methods, particularly by comparing the results of the spin-wave theory and the bosonization approach.
Two-sublattice general spin-s exchange antiferromagnets, assumed to have a stable configuration in applied uniform external magnetic fields parallel to their spontaneous spin-ordering direction in the absence of a field, are treated in the molecular- or mean-field approximation.
The magnetic phase-boundary line of this antiferromagnetic configuration is shown to have simple closed Cited by: 5. Abstract. The recent discovery of superconductivity under high pressure in the two-leg ladder compound BaFe 2 S 3 [H.
Takahashi et al., Nat. Mater. 14, ()] opens a broad avenue of research, because it represents the first report of pairing tendencies in a quasi-one-dimensional iron-based high-critical-temperature superconductor.
Similarly, as in the case of the cuprates, ladders and. Ferromagnetism 1. Mean ﬁeld theory 2. Exchange interactions 3. Band magnetism 4. Beyond mean-ﬁeld theory 5. Anisotropy 6. Ferromagnetic phenomena Comments and corrections please: [email protected] Dublin February 2 The characteristic feature of ferromagnetic order is spontaneous.
The ground state of these materials is a spin-liquid state that can be described well via the Jordan–Wigner fermions, which permit an easy definition of the magnetic particle and thermal currents. The magnetic and magnetic thermal conductivities are calculated in the present work using the bond–mean field : Mohamed Azzouz.
1 Molecular Field Theory of Antiferromagnetism 2 equal and oppositely-directed magnetic sublattices 2 Weiss coefficients to represent inter- and intra-sublattice interactions. H Ai = n’ WM A + n WM B +H HBi = nWM A + n’ WM B +H Magnetization of each sublattice is represented by a Brillouin function, and each falls to zero at the critical.
The complexity of antiferromagnetic interactions and 2D lattices the Local Hamiltonian problem. We study the natural special case of the Local Hamiltonian problem where the same 2-local interaction, with di ering weights, is applied across each pair for the antiferromagnetic XY interaction by Childs, Gosset and Webb , using di erent.
Antiferromagnetic and frustrated order Here I addressthe orderingwhich happens when the interactionsfavoranti-alignment of the spins. 1 Antiferromagnetic interactions predominate in Real local moment systems are mostly ionic insulators, in which the dominant interaction is superexchange which (as seen in Lec.
) usually is Size: KB. Antiferromagnetism, type of magnetism in solids such as manganese oxide (MnO) in which adjacent ions that behave as tiny magnets (in this case manganese ions, Mn2+) spontaneously align themselves at relatively low temperatures into opposite, or antiparallel, arrangements throughout the material so.
Magnetic properties of antiferromagnetic superloitices with an appropriate magnetic period boundary condition. Equations (2) and (8) contain a total of ZP, equations (Pm is the period of the magnetic structure), which constitute a set of simultaneous equations.
Using a simulation Newton method to calculate directly the set. The LibreTexts libraries are Powered by MindTouch ® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot.
We also acknowledge previous National Science Foundation support under grant numbers, and The Lieb-Mattis theorem is generalized to an antiferromagnetic spin-ladder model with four-spin cyclic exchange interaction.
We prove that for J>2K, the antiferromagnetic ordering of energy levels takes place separately in two sectors, which. Abstract We study the low-energy excitations of the spin- (1)/(2) antiferromagnetic Heisenberg chain and N -leg (N=2,3,4) ladders in a staggered magnetic field h show that h s induces gap and midgap states in all the cases and we will examine their field scaling behavior.
A modified boundary scheme is devised to extract accurate bulk excitation behavior. We study the zero temperature antiferromagnetic metal to antiferromagnetic insulator transition using dynamical mean ﬁeld theory and exact diagonalization methods.
We ﬁnd two qualitatively different behaviors depending on the degree of magnetic correlations. For strong correlations combined with magnetic frustration, the transition can be.has two types - ferromagnetic coupling and antiferromagnetic coupling.
They are widely applied for technological applications, such as giant magnetoresistance (GMR) using antiferromagnetic coupling at interface of the magnetic thin film multilayer in order to increase areal density from .By using this service, you agree to input your real email address and only send it to people you know.
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