Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: Poster Session: Disordered Quantum Systems
TT 30.1: Poster
Montag, 12. März 2018, 15:00–19:00, Poster B
On the relation between chicken eyes and superconducting vortex lattices — •Jose Benito-Llorens1,2, Anton Fente1,2, Edwin Herrera1,2, Hermann Suderow1,2, and Isabel Guillamón1,2 — 1Laboratorio de Bajas Temperaturas y Altos Campos Magnéticos, Unidad Asociada UAM, CSIC, Departamento de Física de la Materia Condensada — 2Instituto de Ciencia de Materiales de Madrid Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Spain
The arrangements of cells in a chicken eye are not randomly disordered, but are instead hyperuniform. Hyperuniformity is also observed in superconducting vortex lattices, even when vortex pinning centers are arranged randomly.
Here we analyze images of disordered superconducting vortex lattices taken with a scanning tunneling microscope. We analyze the potential that creates the disorder influencing the vortex lattice and present two limiting cases, random pinning and uncorrelated long range disorder created by a 1D potential at an angle with the vortex lattice. The latter is a hyperuniform potential in a somewhat trivial way, because it is a discommensuration between two ordered lattices.
We find that in both cases, the structure factor of the vortex lattice decreases to zero for large wavelengths with power laws. We discuss imaging experiments showing vortex motion and their relevance for the proposed phenomena.
Work supported by Spanish MINECO, ERC, Starting Grant and CIG Marie Curie program.