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TT: Fachverband Tiefe Temperaturen

TT 81: Superconductivity: Properties and Electronic Structure

TT 81.2: Vortrag

Donnerstag, 3. April 2014, 09:45–10:00, HSZ 201

Strain homogeneity in uniaxial stress and strain measurements — •Mark E. Barber¹, Cliford W. Hicks^1,2, Stephen D. Edkins¹, Daniel O. Brodsky¹, and Andrew P. Mackenzie^1,2 — ¹Scottish Universities Physics Alliance (SUPA), University of St. Andrews, St. Andrews, United Kingdom — ²Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

Response to uniaxial distortion can be a powerful probe of the electronic properties of a solid. However, it is not a very commonly applied technique, chiefly because of the technical challenges of obtaining good strain homogeneity while applying significant pressures. In typical uniaxial pressure measurements, thin and wide samples are clamped between two anvils. We have carried out measurements on Sr₂RuO₄ using a different, easier technique: cutting the sample into a long, narrow bar, and securing its two ends with epoxy across a vice. We explain the details of this technique and by using finite element simulations present the guidelines (readily achievable in experiments) that need to be followed in order to achieve high strain homogeneity.