Wednesday, February 6, 2008, 11:00 am — Bldg. 480 conference room
The discovery of superconductivity (SC) coexisting with magnetic order in a class of ruthenium-based high-TC compounds has initiated intense experimental and theoretical investigations in recent years. We review recent measurements of the superconducting (TC) and magnetic (TM) transitions in two different systems: the Cu-doped Sr2YRuO6 and Eu2-xCexRuSr2Cu2O10-δ (Ru-2122). For Ru-2122 with x=0.8-0.4, SC in the CuO2 planes and the weak-ferromagnetism in the Ru sub-lattice coexists. The magnetic structure of the Ru-2122 is still debated and no conclusions have been reached as yet. One of the disputed questions is whether the magnetic structure corresponds to either homogeneously whole or phase separation materials. I shall present the mechanism of SC and three alternative magnetic models for Ru-2122, which are used in understanding the qualitative features at low applied fields. The common features of the high-temperature superconducting cuprates are sequences of CuO2 layers that upon sufficient doping become superconducting. It has been one major challenge to search for the possibility of finding new superconductors that contain no Cu-O planes. Intriguingly, SC has been observed in Cu-doped Sr2YRuO6 which antiferromagnetically orders at 26 K. In order to gain additional insight into the superconducting properties of Sr2Y(Ru1-xCux)O6 ceramic compounds, I present the results of SEM, magnetic, and Raman-scattering.
Hosted by: Ivan Bozovic
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