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TT: Fachverband Tiefe Temperaturen
TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique
TT 16.16: Poster
Montag, 16. März 2020, 15:00–19:00, P2/EG
FIB-Fabricated Micro-Resonators to Probe Symmetry Breaking in Unconventional Superconductors — •Amelia Estry1, Carsten Putzke1, Chunyu Guo1, Markus König2, and Philip J. W. Moll1 — 1Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
Determining the broken symmetries in the strongly correlated states of unconventional superconductors is critical to their understanding. I will present a measurement technique currently being developed to probe symmetry breaking by examining the elastic moduli in crystalline micro-resonators in their competing ground states. We use Focused Ion Beam (FIB) micro-machining to cut cantilevers with well-defined geometry and crystallographic direction directly out of high-quality single crystals. The hundred-nanometer resolution of FIB fabrication leads to well-defined boundary conditions for the simulation of the elastic problem. We propose to explore symmetries by studying the resonance frequencies of cantilevers with different crystallographic orientations and complex shapes. The proximity of the pseudogap in cuprates and nematicity in pnictides to superconductivity raises the question of their interplay and possible common origin. Particularly, the pseudogap is debated to be either a crossover of energy scales or a distinct thermodynamic phase. With this novel approach we aim to identify the symmetries in the pseudogap, probing current theoretical predictions.