Optical non-reciprocity in magnetic structures related to high-Tc superconductors

Recent neutron scattering [1,2], and optical measurements [3,4] have detected evidence in underdoped cuprate superconductors for a phase transition near the pseudogap onset temperature T* to a time reversal-breaking state. The neutron scattering indicates antiferromagnetic ordering, while it is often assumed that optical polarization rotation requires at least a weak ferromagnetic component. In this note we identify several antiferromagnetic structures, compatible with neutron scattering data, that allow intrinsic polarization rotation through the magnetoelectic effect

Alkaline battery separator characterization studies Quarterly report, 28 Apr. - 28 Jul. 1969

Absorber evaluation of alkaline battery separator systems with electrolyte wetting and wicking measuremen

Alkaline battery separator characterization studies Quarterly report, 28 Jun. - 28 Sep. 1969

Membrane and absorber screening tests for alkaline battery separator

A non-linear transport method for detecting superconducting stripes

We theoretically study the effect of stripe-like superconducting inclusions on the non-linear resistivity in single crystals. Even when the stripe orientation varies throughout the sample between two orthogonal directions due to twinning, we predict that there should be a universal scaling relationship between the nonlinear resistivity curves measured at different angles relative to the crystal axes. This prediction can be used to verify or rule out the existence of superconducting stripes at and above the superconducting transition temperature in cuprate superconductors.Comment: 4 pages, 4 figure

Low Temperature AC Conductivity in BSCCO (2212)

We report measurements of anamolously large dissipative conductivities in BiSrCaCuO(2212) at low temperatures. We have measured the complex conductivity of BSCCO thin films at 100-600 GHz as a function of doping from the underdoped to the overdoped state. At low temperatures there exists a residual dissipative conductivity which scales with the T=0 superfluid density as the doping is varied. This residual dissipative conductivity is larger than the possible contribution from a thermal population of quasiparticles at the d-wave gap nodes.Comment: Submitted to the Proceedings of the 22nd International Low Temperature Physics Conference. To be published in Physica B (http://www.elsevier.nl/locate/physb); 2 Pages with 2 Figure