A model-free theoretical framework for a phenomenological description of spin-lattice relaxation by anomalous translational diffusion in inhomogeneous systems based on the fractional diffusion equation is developed. The dependence of the spin-lattice relaxation time on the size of the pores in porous glass Vycor is experimentally obtained and found to agree well with our theoretical predictions...

Abstract We study the transition of short range Ising spin glasses in a magnetic field, within a general replica symmetric field theory, which contains three masses and eight cubic couplings, that is defined in terms of the fields representing the replicon, anomalous and longitudinal modes. We discuss the symmetry of the theory in the limit of replica number n → 0, and consider the regular case...

It is a challenge to calorimetrically determine the glass transition temperature (Tg) of vitreous silica. Here, we demonstrate that this challenge mainly arises from the extremely high sensitivity of the Tg to the hydroxyl content, but also from decrease of the Tg with repeating the calorimetric scans. It is known that the liquid fragility (i.e., the speed of the viscous slow-down of a supercoo...

Glass-ceramics from the studied system are able to precipitate a crystalline phase with an anomalous and low coefficient of thermal expansion. Besides called LEAZit (Low Expansion Alkaline Earth Zinc Silicate), other phases appear within those glass-ceramics. In order understand expansion behavior whole material, content has be known as function composition chosen heat treatment. this paper, gl...

The realization of the spin-glass (SG) state in Heusler alloys is very rare despite presence inherent structural and elemental disorder those compounds. Although a few half- full-Heusler are known to exhibit SG state, there hardly any manifestation same cases quaternary Here we report observation highly disordered equiatomic compound: FeRuMnGa where between canonical cluster glass. Different in...

We present helium atom scattering measurements of the boson peak at the surface of vitreous silica between 127.0 and 368.5 K. The most probable energy shows a strong temperature dependence and increases linearly with temperature in the measured range. The observed blueshift of the surface boson peak (shift rate 0.008+/-0.002 meV/K) is a factor of 4 to 10 times stronger than shift rates measured...

Understanding why the glass transition temperature (Tg) of polymers deviates substantially for the bulk with nanoscale confinement has been a 20-year mystery. Ever since the observation in the mid-1990s that the Tg values of amorphous polymer thin films are different from their bulk values, efforts to understand this behavior have intensified, and the topic remains the subject of intense resear...