v 1 2 7 A ug 1 99 6 Interband effects in the c - axis optical conductivity in YBa

A ug 1 99 9 First order phase transition of the vortex lattice in twinned YBa 2 Cu 3 O 7 single crystals in tilted magnetic fields

02 v 1 1 J ul 1 99 4 The Abrikosov Flux Lattice in Planar Crystals of YBa 2 Cu 3 O 7 − δ

Determination of the condensate from optical techniques in unconventional superconductors

The optical properties of superconductors, in particular the real parts of the conductivity and the dielectric function, may be used to calculate the strength of the condensate. In systems where all the free carriers collapse into the condensate, this approach works well. However, in gapless systems, and in unconventional systems in which the superconducting energy gap is observed to have zeros...

ar X iv : c on d - m at / 9 20 80 02 v 1 5 A ug 1 99 2 Transport Properties of the Infinite Dimensional Hubbard Model

Results for the optical conductivity and resistivity of the Hubbard model in infinite spatial dimensions are presented. At half filling we observe a gradual crossover from a normal Fermi-liquid with a Drude peak at ω = 0 in the optical conductivity to an insulator as a function of U for temperatures above the antiferromagnetic phase transition. When doped, the “insulator” becomes a Fermi-liquid...

st ro - p h / 95 01 02 9 v 2 1 A ug 1 99 5 A Dust Lane in the Radio galaxy 3 C 270

We present broad band surface photometry of the radio galaxy 3C270 (NGC 4261). We find a distinct dust lane in the V −R image of the galaxy, and determine its orientation and size. We use the major axis profile of the galaxy to estimate the optical depth of the dust lane, and discuss the significance of the lane to the shape of the galaxy. Subject headings: Galaxies: active; Galaxies: radio; Ga...