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Book Energy Research Abstracts

Download or read book Energy Research Abstracts written by and published by . This book was released on 1989 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Energy Research Abstracts

Download or read book Energy Research Abstracts written by and published by . This book was released on 1989 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Physics Briefs

Download or read book Physics Briefs written by and published by . This book was released on 1991 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book INIS Atomindex

Download or read book INIS Atomindex written by and published by . This book was released on 1987 with total page 1038 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Static and Dynamic Behaviour of Some Ferromagnets

Download or read book Static and Dynamic Behaviour of Some Ferromagnets written by Willem L. Rutten and published by . This book was released on 1979 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Government Reports Announcements Index

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1988-06 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Statics and Dynamics of Weakly Coupled Antiferromagnetic Spin 1 2 Ladders in a Magnetic Field

Download or read book Statics and Dynamics of Weakly Coupled Antiferromagnetic Spin 1 2 Ladders in a Magnetic Field written by Pierre Bouillot and published by Springer Science & Business Media. This book was released on 2012-12-14 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Heisenberg Antiferromagnetic Model on 2D Quasiperiodic Tilings

Download or read book Heisenberg Antiferromagnetic Model on 2D Quasiperiodic Tilings written by Attila Szàllàs and published by . This book was released on 2008 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Penrose tiling is a perfectly ordered two dimensional structure with fivefold symmetry and scale invariance. We considered a Heisenberg antiferromagnet on the Penrose rhombus tiling, and showed it has an inhomogeneous Neel-ordered ground state. Spin wave energies and wavefunctions were studied in the linear spin wave approximation. Spatial properties of eigenmodes were characterized in several different ways. At low energies, eigenstates were found to be relatively extended, and appeared to show multifractal scaling. At higher energies, states were found to be more localized, and, depending on the energy, confined to sites of a specified coordination number. The ground state energy of this antiferromagnet, and local staggered magnetizations were calculated. Perpendicular space projections were shown, showing the underlying simplicity of this "complex" ground state. A simple analytical model, the two-tier Heisenberg star, was presented to explain the staggered magnetization distribution in this antiferromagnetic system. The effects of a novel type of disorder in a two dimensional quantum antiferromagnet is considered. The original bipartite structure is geometrically disordered in such a way that no frustration is introduced, and the system retains a Neel ordered ground state. We show, using a linear spin wave expansion and QMC, that the staggered moment decreases exponentially as a function of increasing disorder. The spatial distribution of staggered magnetizations becomes more homogeneous compared to the deterministic tiling, the effective spin wave velocity increases with disorder, and singularities in the magnon spectrum and wavefunctions are partly smoothed.

Book Introduction to Frustrated Magnetism

Download or read book Introduction to Frustrated Magnetism written by Claudine Lacroix and published by Springer Science & Business Media. This book was released on 2011-01-12 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of highly frustrated magnetism has developed considerably and expanded over the last 15 years. Issuing from canonical geometric frustration of interactions, it now extends over other aspects with many degrees of freedom such as magneto-elastic couplings, orbital degrees of freedom, dilution effects, and electron doping. Its is thus shown here that the concept of frustration impacts on many other fields in physics than magnetism. This book represents a state-of-the-art review aimed at a broad audience with tutorial chapters and more topical ones, encompassing solid-state chemistry, experimental and theoretical physics.

Book Science Abstracts

Download or read book Science Abstracts written by and published by . This book was released on 1992 with total page 1228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Theory of the Spin Liquid State of the Heisenberg Antiferromagnet

Download or read book Theory of the Spin Liquid State of the Heisenberg Antiferromagnet written by Vadim Kalmeyer and published by . This book was released on 1989 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Two layer Heisenberg Model of Quasi 2D Triangular Lattice Antiferromagnet and Study of the Magnetoelastic Coupling in Ba3CoSb2O9 Using Sound Velocity Measurements

Download or read book Two layer Heisenberg Model of Quasi 2D Triangular Lattice Antiferromagnet and Study of the Magnetoelastic Coupling in Ba3CoSb2O9 Using Sound Velocity Measurements written by Ming Li and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The magnetic field evolution of ground spin states of the stacked planar triangular antiferromagnet with antiferromagnetic interlayer interaction Jc is explored using a minimal 3D classical Heisenberg model (published in Ref. [1]). A bi-quadratic coupling is also used to mimic the effect of spin fluctuations [2] which are known to stabilize the magnetization plateau. A single ion anisotropy is included and states with a magnetic field applied in the ab-plane and along the c-axis are determined. For H || ab-plane, an additional state, in contrast to the 2D model [2], is obtained with weak interlayer interaction. Meanwhile the magnetization plateau decreases with the increment of Jc and vanishes at medium values of Jc. Moreover, two new states with a small z components of spins emerge with large Jc. For H || c-axis, an extra state, compared with the 2D model, is obtained with a weak interlayer interaction. When Jc is large enough, only the state corresponding to the Umbrella phase in the 2D model exists. High-resolution ultrasonic measurements are used to study magnetoelastic coupling as a function of the inplane magnetic field orientation in the spin-1/2 triangular lattice antiferromagnet Ba3CoSb2O9 (published in Ref. [3]). Via these measurements, the relevance of this coupling in stabilizing the 1/3 magnetization plateau (up-up-down state) is explored. The analysis indicates that, while the magnetoelastic coupling in Ba3CoSb2O9 is large, in comparison to other triangular lattice antiferromagnets, the strength of this coupling is still too small to fully account for the magnetization plateau width in Ba3CoSb2O9. Spin fluctuations are therefore the dominant mechanism inducing and stabilizing the magnetization plateau. Our results also show that the amplitude of the spin fluctuations suddenly drops as the V phase is induced at higher field. Furthermore, as the temperature approaches the uud phase boundary from the paramagnetic state, the short range spin correlation, responsible for the softening of the acoustic modes, are also observed. Comparing the experimental results in ordered states at different temperatures, our results indicate that the effect of the thermal fluctuations on the magnetoelastic coupling are negligible at low temperatures in comparison to that of the quantum fluctuations.