Duane Physics Room G126

Using anisotropic strain to probe multipolar order parameters

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Abstract: Because it can be applied in-situ in a continuous fashion, and can be tailored to preserve or break selected spatial symmetries, piezoelectric devices-based strain has lately emerged as a versatile tuning parameter of quantum materials. In this talk we will focus on utilizing anisotropic strain as a probe of otherwise elusive multipolar orders in solids. Using the adiabatic AC elastocaloric effect, a compact, thermodynamic strain-based experimental technique [1,2], we study anisotropic strain effects on f electron-based multipolar orders [3,4].

How strong can the electron-phonon interaction in metals be?

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Lunch will be provided at 12:00pm, so please come early to eat mingle and eat lunch before the talk begins.

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Abstract: I’ll show that there exists a fundamental upper limit on the electron-phonon coupling strength in metals. This, in turn, implies an upper bound on the superconducting Tc. I’ll compare these bounds with new and old experimental data and ague that our theory explains several previously poorly understood experiments, such as the observation of metastable high-temperature superconductivity in FeSe.

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