Phase transitions in RbCoCl3 · 2H2O

Differential susceptibility measurements were performed on a single crystal of RbCoCl₃ · 2H₂O. An anti-ferromagnetic ordering was found at 2.975 K.     

The Use of Chebyshev Polynomials in the Space–Time Least-Squares Spectral Element Method

Chebyshev polynomials of the first kind are employed in a space–time least-squares spectral element formulation applied to linear and nonlinear hyperbolic scalar equations. No stabilization techniques are required to render a stable, high order accurate scheme. In parts of the domain where the underlying exact solution is smooth, the scheme exhibits exponential convergence with polynomial enrichment, whereas in parts of the domain where the underlying exact solution contains discontinuities the solution displays a Gibbs-like behavior. An edge detection method is employed to determine the position of the discontinuity. Piecewise reconstruction of the numerical solution retrieves a monotone solution. Numerical results will be given in which the capabilities of the space–time formulation to capture discontinuities will be demonstrated.     

AFM studies of surface morphologies of sputtered SrTiO3 films and annealed MgO substrates

3 films on single-crystal MgO(100) substrates. Meanwhile, surface morphologies of as-polished and post-annealed MgO(100) substrates are investigated as well. Effects of the miscut (or misorientation) of the substrate surface on morphologies and growth mechanisms are discussed. For comparison, a typical surface morphology and growth mechanism of the spiral island structure in sputtered PrBa₂Cu₃O_7-δ films on MgO(100) substrates are presented. Received: 27 March 1998     

Transient effects in the electrically controlled light transmission of a twisted nematic layer

An oscillatory after-effect in the light transmission of a twisted nematic layer is often observed when the driving field is switched off. The effect is explained as being caused by fluid motion.