Events at Physics

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Events During the Week of January 15th through January 22nd, 2012

Monday, January 16th, 2012

Martin Luther King Day

Tuesday, January 17th, 2012

No events scheduled

Wednesday, January 18th, 2012

Physics Department Colloquium
Title to be announced
Time: 12:00 am
Speaker: No Colloquium -- please remove
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Thursday, January 19th, 2012

R. G. Herb Condensed Matter Seminar
Nematic order and magnetism in the high-temperature iron-based superconductors
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Rafael Fernandes, Columbia University
Abstract: The recent discovery of iron-based compounds displaying superconductivity at nearly 60K opened a new direction in the research of high-temperature superconductors. Much of the interest lies in understanding not only their superconducting pairing mechanism, but also their normal state properties. In this talk, I will show that emergent Ising-nematic degrees of freedom are present in these systems over wide temperature and doping ranges, fundamentally affecting their macroscopic properties and explaining several behaviors observed experimentally. Starting from a microscopic electronic model, I will demonstrate that the nematic state has magnetic origin, and is associated with a spontaneous tetragonal symmetry-breaking. I will discuss the phase diagrams resulting from this model, and how the elastic properties are affected by nematic fluctuations. I will also show that the scattering of electrons by impurities and by spin fluctuations in the nematic phase leads to an anisotropy in the resistivity, whose sign changes from electron-doped to hole-doped compounds.
Host: Chubukov
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Friday, January 20th, 2012

No events scheduled