Condensed-Matter Physics & Materials Science Seminar

"Pressure tuning of quantum ordering of high temperature superconductors"

Presented by Xiaojia Chen, Carnegie Institution of Washington

Thursday, February 2, 2012, 1:30 pm — Small Seminar Room, Bldg. 510

Currently, cuprate and iron-based superconductors were recognized as the two systems having high temperature superconductivity. Pressure plays an essential role in inducing or tuning superconductivity as well as shedding insight on the mechanism of superconductivity in these systems. Finding ways to control the quantum coherence properties to have a higher critical temperature Tc than the material has remains a challenge. There has not been an agreement regarding the underlying mechanism of high temperature superconductivity. Here I first will talk about our recent experimental efforts in both directions for cuprates. Specifically I will show what constraint on superconductivity upon compression we obtained, how we can achieve remarkably high Tc through the pressure tuning of competing electronic order, and how we can use electronic Raman scattering to identify the mechanism of superconductivity. I also will introduce how superconductivity can be tuned and/or induced by ordering in newly discovered iron chalcogenide superconductors.

Hosted by: Guangyong Xu

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