Hyperuniform vortex matter in type-II superconductors

FASANO, Y.

virtual

Conferencia; Invited parallel talk in the International Conference on Strongly Correlated Electronic Systems (SCES)- final virtual meeting; 2021

UniCAmp Brasil

Many biological, material and mathematical systems share the special property of beinghyperuniform, namely of presenting vanishing infinite-wavelength density fluctuations. Thismeans that the density of the constituent objects is homogeneous in the large scale, as in a perfectcrystal, although they can be isotropic and disordered like a liquid. Hyperuniform structurespresent a structure factor that algebraically decays to zero when decreasing the reciprocal-spacewavenumber q due to the suppression of particle density fluctuations at large direct-space lengthscales.This "hidden order" present in disordered systems can be affected by the type of disorderof the host medium where the objects are nucleated. Vortex matter nucleated at the surface ofsuperconducting samples with weak point-like disorder are ordered and disordered hyperuniformsystems.[1,2] In this work we study experimentally and theoretically how planar correlateddisorder in the medium affects this property. We show that correlated strong disorder generatedby planes of defects traversing the whole sample thickness suppress the hyperuniformity of thestructure. This particular type of disorder produces a structure factor that decays at smallwavenumbers but saturates in the limit q->0 due to persisting vortex density fluctuations at largelengthscales. We also show that this suppression is concomitant to anisotropic vortex densityfluctuations.[1] G. Rumi, J. Aragón Sánchez, F. Elías, R. Cortés Maldonado, J. R. Puig, N. R. Cejas Bolecek,G. Nieva, M. Konczykowski, Y. Fasano and A.B. Kolton, Physical Review Research 1, 033057(2019).[2] J. B. Llorens, I. Guillamón, I. García-Serrano, R. Córdoba, J. Sesé, J.M. De Teresa, M. R.Ibarra, S. Vieira, M. Ortuño and H. Suderow, Physical Review Research 2, 033133 (2020).