We observe the negative shift of the magnetic hysteresis loop at 5 K, while the sample is cooled in external magnetic field in case of 30% of Fe substitution in LaMnO<Subscript>3</Subscript>. The negative shift and training effect of the hysteresis loops indicate the phenomenon of exchange bias. The cooling field...</subscript>

We report the charge state modification effects at the Mn site on the ground state properties of colossal magnetoresistive manganites. Ta<Superscript>5+</Superscript> substitution results in an appreciable increase in the lattice parameters and unit cell volume due to increased Mn<Superscript>3+</Superscript> concentration. The...</superscript></superscript>

We study thermal convection in a colloidal glass of Laponite in formation. Low concentration preparation are submitted to destabilizing vertical temperature gradient, and present a gradual transition from a turbulent convective state to a steady conductive state as their viscosity increases. The...

For honeycomb, square and triangular lattices we consider the groundstate threshold pc of spontaneous absolute magnetization in iso- and anisotropic random +/-J Ising models from so-called uniform classes HCz,SQz,TRz. The class index z(⩾1) gives a fixed number of so-called PAF-bonds on the...

Motivated by impurity-induced magnetic ordering phenomena in spin-gap materials like TlCuCl<Subscript>3</Subscript>, we develop a mean-field theory for strongly disordered antiferromagnets, designed to capture the broad distribution of coupling constants in the effective model for the impurity degrees of freedom....</subscript>

Finite size effects on dynamical heterogeneity are studied in liquid silica with Molecular Dynamics simulations using the BKS potential model. When the system size decreases relaxation times are found to increase in accordance with previous results in finite-size simulations and confined...

Using atomic force microscopy on silica and float glass surfaces, we give evidence that the roughness of melted glass surfaces can be quantitatively accounted for by frozen capillary waves. In this framework the height spatial correlations are shown to obey a logarithmic scaling law; the...

A model of thermal relaxation within localized states based on the extended multiple trapping framework is used to describe the red-shift of the emission maximum intensity as the excitation energy decreases. The model is applied to amorphous hydrogenated silicon (a-Si:H) and to organic-inorganic...

The three-dimensional bimodal random-field Ising model is studied via a new finite temperature numerical approach. The methods of Wang-Landau sampling and broad histogram are implemented in a unified algorithm by using the N-fold version of the Wang-Landau algorithm. The simulations are...