Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 28: Correlated Electrons: Quantum-Critical Phenomena - Experiment

TT 28.2: Vortrag

Dienstag, 8. März 2016, 10:15–10:30, H21

Effect of Uniaxial Strain on the Quantum Critical Phase of Sr₃Ru₂O₇ — •Mark E. Barber^1,2, Daniel O. Brodsky^1,2, Clifford W. Hicks², Robin Perry³, and Andrew P. Mackenzie^1,2 — ¹Scottish Universities Physics Alliance (SUPA), School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom — ²Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, Dresden 01187, Germany — ³School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom

Sr₃Ru₂O₇ has a metamagnetic quantum critical endpoint, which in highly pure samples is masked by a novel phase. This phase is isotropic in the absence of symmetry-breaking fields, but weak in-plane magnetic fields are well-known to induce strong resistive anisotropy, leading to speculation that the phase intrinsically breaks the tetragonal symmetry of the lattice. We have used uniaxial strain to break the symmetry of the lattice and have found a dramatic response: compression by 0.1%, for example, induces a resistive anisotropy of ∼ 2.5. I will discuss these results in the context of the underlying symmetry of the anomalous phase.