Metallic bands in chevron-type polyacenes

Effective temperature dynamics of shear bands in metallic glasses.

We study the plastic deformation of bulk metallic glasses with shear transformation zone (STZ) theory, a physical model for plasticity in amorphous systems, and compare it with experimental data. In STZ theory, plastic deformation occurs when localized regions rearrange due to applied stress and the density of these regions is determined by a dynamically evolving effective disorder temperature....

Shear bands and cracking of metallic glass plates in bending

The thickness dependence of yielding and fracture of metallic glass plates subjected to bending is considered in terms of the shear band processes responsible for these properties. We argue that the shear band spacing ~and length! scales with the thickness of the plate because of strain relaxation in the vicinity of the shear band at the surface. This is consistent with recent measurements of s...

Localized crystallization in shear bands of a metallic glass

Stress-induced viscous flow is the characteristic of atomic movements during plastic deformation of metallic glasses in the absence of substantial temperature increase, which suggests that stress state plays an important role in mechanically induced crystallization in a metallic glass. However, it is poorly understood. Here, we report on the stress-induced localized crystallization in individua...

Chevron in the Circuit Courts

Transport and excess noise in polyacenes under trap filling transition

Recent measurements in organic semiconductors (polyacenes) have evidenced a strong superlinear increase of the current-voltage characteristics associated with a sharp peak of the relative spectral density of current noise. Both features occur at the trap filling transition (TFT), i.e. at voltages corresponding to the transition between the Ohmic regime and the space charge limited current (SCLC...