Theory of electrical rectification in a molecular monolayer

The current-voltage characteristics in Langmuir-Blodgett monolayers of \gamma-hexadecylquinolinium tricyanoquinodimethanide (C16H33Q-3CNQ) sandwiched between Al or Au electrodes is calculated, combining ab initio and self-consistent tight binding techniques. The rectification current depends on the position of the LUMO and HOMO relative to the Fermi levels of the electrodes as in the Aviram-Ratner mechanism, but also on the profile of the electrostatic potential which is extremely sensitive to where the electroactive part of the molecule lies in the monolayer. This second effect can produce rectification in the direction opposite to the Aviram-Ratner prediction

Список паразитических грибов, собранных в Харьковской губернии

Когда я стал собирать паразитические грибы в окрестностях г. Харькова, в литературе указаний о распространении таковых в Харьковской губернии не имелось... Грибы собирались мною в ближайших окрестностях города, главным образом в районе движения дачных поездов. Конечными пунктами экскурсий являются, таким образом, Дергачи, Люботин, Мерефа и Чугуев

Magnetism and superconductivity in cuprate heterostructures studied by low energy μSR

eterostructures consisting of magnetic and superconducting layers juxtaposed to each other are ideal systems to investigate the interplay of the two order parameters and possible interlayer coupling. We used the low energy muon spin rotation technique to study magnetic field distributions at different implantation depths in tri-layered films composed of 75 nm thick YBa2Cu3O7-δ layers enclosing a 50 nm thick barrier layer of PrBa2Cu3O7-var epsilon. The PrBa2Cu3O7-var epsilon layer shows the known antiferromagnetic ordering of the Cu and Pr moments, whereas our measurements indicate the formation of a regular vortex lattice in the YBa2Cu3O7-δ layers if an external field is applied perpendicular to the film