Glass Transition and the Coulomb Gap in Electron Glasses

The Coulomb gap and low energy statistics for Coulomb glasses

We study the statistics of local energy minima in the configuration space of two-dimensional lattice Coulomb glasses with site disorder and the behavior of the Coulomb gap depending on the strength of random site energies. At intermediate disorder, i.e., when the typical strength of the disorder is of the same order as the nearest-neighbor Coulomb energy, the high energy tail of the distributio...

Mechanical relaxation in glasses and at the glass transition

The Gilroy-Phillips model of relaxational jumps in asymmetric double well potentials, developed for the Arrhenius-type secondary relaxations of the glass phase, is extended to a formal description of the breakdown of the shear modulus at the glass transition, the α-process. The extension requires the introduction of two separate parts of the barrier distribution function f(V ), with a different...

Study of two-electron jumps in relaxation of Coulomb glasses

Electron anions and the glass transition temperature.

Properties of glasses are typically controlled by judicious selection of the glass-forming and glass-modifying constituents. Through an experimental and computational study of the crystalline, molten, and amorphous [Ca12Al14O32](2+) ⋅ (e(-))2, we demonstrate that electron anions in this system behave as glass modifiers that strongly affect solidification dynamics, the glass transition temperatu...

On the Glass Transition Temperature in Covalent Glasses

We give a simple demonstration of the formula relating the glass transition temperature, Tg, to the molar concentration x of a modifier in two types of glasses: binary glasses, whose composition can be denoted by XnYm+xMpYq, with X an element of III-rd or IV -th group (e.g. B, or Si, Ge), while MpYq is an alkali oxide or chalcogenide; next, the network glasses of the type Ax B1−x, e.g. Gex Se1−...