Titlebook: Magnetic Properties of Layered Transition Metal Compounds; L. J. Jongh Book 1990 Kluwer Academic Publishers 1990 crystal.crystallography.n

協(xié)迫

R. Navarroset semantics. We present a domain independent system of axioms, written as an extended logic program, which defines reasoning with prioritized defaults. These axioms are used in conjunction with a description of a particular domain encoded in a simple language allowing representation of defaults an

CORE

構(gòu)想

chronicle

L. P. Regnault,J. Rossat-Mignododuces .. A subjective literal allows checking whether some regular literal is true in all (or in some of) the stable models of the program, being those models collected in a set called .. One epistemic program may yield several world views but, under the original G91 semantics, some of them resulte

Amnesty

dithiolethione

CODA

盡忠

Theory of Two-Dimensional Magnets,Section 2), whose discrete symmetry differs from the continuous symmetries of the XY (Section 3) and Heisenberg (Section 4) models, are linear defects (domain walls). In continuously degenerate systems (XY and Heisenberg models) the low- energy excitations are spin-waves. The energy of such a fluctu

招人嫉妒

Application Of High- and Low-Temperature Series Expansions to Two-Dimensional Magnetic Systems,ns fail completely in the critical region. The importance of the fluctuations that are not accounted for in this theory was pointed out by Néel [3] and has inspired the search for other, more realistic models, such as the Ising [5] and Heisenberg [6] models. To apply statistical mechanical methods t

Ingrained

Spin Waves in Two-Dimensional Magnetic Systems: Theory And Applications,ic systems in which the primary interaction is nearest-neighbor Heisenberg exchange. It has since long been recognized that the excitation spectrum of such systems comprises energies that, irrespective of the dimensionality, are substantially below, say, 2..., in which . represents the exchange and