Josephson effect in d-wave superconductor junctions in a lattice model

Josephson current between two d-wave superconductors is calculated by using a lattice model. Here we consider two types of junctions, $i.e.$, the parallel junction and the mirror-type junction. The maximum Josephson current $(J_{c})$ shows a wide variety of temperature ($T$) dependence depending on the misorientation angles and the types of junctions. When the misorientation angles are not zero, the Josephson current shows the low-temperature anomaly because of a zero energy state (ZES) at the interfaces. In the case of mirror-type junctions, $J_c$ has a non monotonic temperature dependence. These results are consistent with the previous results based on the quasiclassical theory. [Y. Tanaka and S. Kashiwaya: Phys. Rev. B \textbf{56} (1997) 892.] On the other hand, we find that the ZES disappears in several junctions because of the Freidel oscillations of the wave function, which is peculiar to the lattice model. In such junctions, the temperature dependence of $J_{c}$ is close to the Ambegaokar-Baratoff relation.Comment: 17 pages, 10 figures, using jpsj2.cls and oversite.st

Argon concentration in waters of the Atlantic Ocean

Neutron activation analysis was used to determine content of dissolved argon at five points in the Atlantic Ocean at depths of 2 m

The experience of identification of painting materials on example of research in Nizhny tagil museum of fine arts

Not many museums have an equipped laboratory for thorough technical study of their own collections. Meanwhile such study is an important part in art attribution. This paper is a description of the technical study in Nizhny Tagil Museum of Fine Arts. We applied various methods for identification of painting materials using equipment of «Laboratory of technical study in art» UrFU. The data obtained during technical study will be used to clarify the origin and attribution of the Nizhny Tagil Museum collection.Не многие музеи имеют оборудованную лабораторию для подробного технико-технологического исследования своих коллекций. Тогда как подобное изучение живописных материалов является важным этапом атрибуции живописных произведений. Настоящая работа является описанием проведенного технико-технологического исследования ряда работ из коллекции Нижнетагильского музея истории искусств (НТМИИ). С помощью оборудования «Лаборатории экспертизы и реставрации объектов культуры и искусства» УрФУ были применены различные методы по идентификации живописных изображений. Данные, полученные в результате исследования, будут использованы для уточнения происхождения и атрибуции коллекции западно-европейского и русского искусства НТМИИ

Intramolecular charge transfer in the excited state Kinetics and configurational changes

The fast excited state intramolecular charge transfer (ICT) and dual fluorescence observed with several 4-aminobenzonitriles is discussed. The magnitude of the energy gap between the two lowest excited states is shown to determine the occurrence or absence of ICT. The excited state behaviour of a series of six 4-aminobenzonitriles in which the amino nitrogen atom is part of a three- to eight-membered heterocyclic ring, P3C to P8C, is studied by using photostationary and time-resolved fluorescence measurements. The ICT rate constant strongly decreases with decreasing ring size. ICT does not occur with P3C and P4C in diethyl ether. This is attributed to the increase of the amino nitrogen inversion barrier with decreasing ring size. The configurational change of the amino nitrogen from pyramidal to planar is considered to be an important reaction coordinate in the ICT process. The photophysics of the 4-aminobenzonitriles is different from that of other systems such as donor/acceptor-substituted stilbenes and 9,9'-bianthryl, which are governed by the charge distribution and macroscopic Coulombic interaction in their CT states