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Recent Development in High Temperature Superconductivity [SPECIAL COLLOQUIUM]

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Date and time Mar 31, 2009
from 04:00 PM to 05:30 PM
Location Bahen Centre, BA 1130
Host John Wei

Maw-Kuen Wu

Maw-Kuen Wu's Homepage


The discovery early Colloq Mar31last year that the layered iron-based quaternary oxypnictides La[O1-xFx]FeAs superconduct with relatively high transition temperature Tc was a real surprise. This seminal discovery sparked a race to find new iron-based superconductors, much akin to what occurred twenty years ago with the copper-oxide superconductors. La[O1-xFx]FeAs has a layered crystal structure with a Fe-As plane, and with that as inspiration, we took the approach to look for superconductivity in compounds that have a similar Fe-based plane. This search proved fruitful as it was discovered that the PbO-type β-FeSe compound becomes superconducting with resistive transition temperature at 8.5K.

In this presentation, I will review the current progress on the Fe-based superconducting materials, focusing particularly on the FeSe system. I will describe detailed processes for single-crystal growth and for fabrication of high-quality superconducting thin films. I will also discuss chemical doping effects on the FeSe system, and then summarize the physical properties being characterized. There exist interesting transport anomalies in the resistivity and Hall coefficient at low temperatures. It is clear from our studies that a low-temperature structural distortion is critical to the occurrence of superconductivity in these materials.

Coffee and cookies will be
served at 3:40 p.m.

Affiliation Sponsored by Department of Physics and Department of Materials Science & Engineering
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Contact Phone 416-978-7135
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