Titlebook: Recent Developments in Condensed Matter Physics; Volume 4 ? Low-Dimen J. T. Devreese (Chairman of the Conference),L. F. Book 1981 Plenum P

LEVY

NUDGE

Pyroelectric Effect and Ferroelectric Phase Transition in BixSb1-xSIntial difference across a short-circuiting resistance, while heating the samples at uniform rates. Critical temperature T. follows a rapid linear decrease when x increases up to 0.50, with a slope of 36 K per 0.10 Bi concentration. Critical exponent β of polarization, deduced from measurements of py

Gustatory

Phase Changes in Metallic Mn3GaC: Heat Capacity Measurementser, and at T. = (243± 1) K, of second order character. The analysis of Cp below 10 K yiels γ (anti-ferromagnetic) = 0.0182 J/mol.K. and the analysis of the entropy content of the T. anomaly yields γ (paramagnetic) = 0.049 J/mol.K. Moreover, using Cp(Mn.N) to estimate the lattice contribution to Cp(M

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debunk

crucial

Isotropic-Nematic Transition in Liquid Crystalshtly below T., the temperature at which the IN transition actually occurs. Using the temperature and frequency dependences of proton relaxation rates together with the general ideas on the scattering phenomena and nuclear relaxation arising from critical fluctuations in the order parameter, it is de

Promotion

Central Peak and Critical Dynamics of the Transverse Ising Model Above T C *ing model are investigated. Our investigation is based on the resolution of kinetic equations for the correlation functions derived beyond the random phase approximation. We complete previous work by considering a very general interaction made of dipole-dipole, anistropic nearest-neighbour and isotr

Exposure

Birefringence Study of BaMnF4eresis. The exponent of the temperature dependence of the order parameter is β. = 0.30 ± 0.02 in agreement with neutrons scattering results. The analysis of the magnetic contribution to the birefringence demonstrates that some magnetic short-range order subsists till T..

Angioplasty

Spin Reorientation Transition in Gadoliniumnsition in Gd at T. = 223 K. We confirm the negligible role played by fluctuations, but our results imply new consequences on the validity of models to describe the angle of rotation (θ) between the magnetisation and the c-axis in Gd. Quite generally, ρ(θ) = ρ(-θ) from symmetry so that dρ/dT - θ.dθ/