Measured
发表于 2025-3-23 12:39:32
Ordering in Strongly Fluctuating Systems Introductory Comments, amenable to calculation, as later papers will show in detail. Rather I will concentrate on three dimensional problems which are fluctuating in a different way from the familiar fluctuations of equilibrium in which there is a specified Hamiltonian and all states are accessible. This is not only beca
insurgent
发表于 2025-3-23 14:26:46
Real-Space Renormalization-Group Method for Quantum Systems,tum systems show interesting transitions at T = 0 by varying a given parameter. This should be compared with the transitions in temperature of classical systems and, in many cases, a rigorous mapping has been established. The equivalent of a T = 0 quantum system in D dimension is generally a D+1 cla
ASSET
发表于 2025-3-23 20:04:06
Upper Marginal Dimensionality. Concept and Experiment,e of one particular type of system, and we shall chose the language of magnetic systems. It is emphasized that simply by changing a few words the following description may be adapted to describe any second-order phase transition; for example, in the case of the gas-liquid transition around the criti
visual-cortex
发表于 2025-3-23 22:35:10
Lower Marginal Dimensionality. X-Ray Scattering from the Smectic-A Phase of Iquid Crystals,tion X(q) directly measurable by scattering spectroscopy, may be treated in a self-consistent and correct way by simple mean field theory if the dimensionality exceeds a certain marginal dimensionality d*. In particular we stressed that d* depends on the volume in reciprocal space available to the c
deviate
发表于 2025-3-24 03:18:13
Lifshitz Points in Ising Systems with Competing Interactions, disordered, uniformly ordered and modulated ordered phases. Lifshitz points have been suggested for a variety of differedt systems including magnetic alloys.’., liquid crystals., TTF-TCNQ., and perovskites.. Recently, some very interesting experiments on liquid crystals. and on a structural phase t
委托
发表于 2025-3-24 09:35:09
Elementary Excitations in Magnetic Chains,a tutorial way in certain simple cases, namely i) Magnons of XY like chains ii) solitary excitations of Ising-like chains iii) solitons of XY like chains in a field or anisotropy. Experimental examples like TMMC, CsNiF. and CsCoCl. are considered.
lambaste
发表于 2025-3-24 12:54:26
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温和女孩
发表于 2025-3-24 16:46:52
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羊齿
发表于 2025-3-24 19:53:51
Dynamics of The Sine-Gordon Chain: The Kink-Phonon Interaction, Soliton Diffusion and Dynamical Cortations: linear, phonon-like oscillations about some vacuum state and intrinsically non-linear, soliton-like kinks. The consistent scheme which leads to the identification of two separate sectors in the solution space of the nonlinear equation of motion carries the name of configurational phenomenol
使混合
发表于 2025-3-25 00:02:43
The Spin-Wave Continuum of The S=1/2 Linear Heisenberg Antiferromagnet,e statics and the dynamics have remained open. Recent low-temperature neutron-scattering experiments on CuCl.•2N(C.H.) (CPC), which is a good realization of an S=½ HB AF chain, provided new important information on the dynamics of the system, such as lineshapes and the behaviour in a magnetic field