Anomalous magnetic noise in an imperfectly flat landscape in the topological magnet Dy2Ti2O7.

ABSTRACT: Noise generated by motion of charge and spin provides a unique window into materials at the atomic scale. From temperature of resistors to electrons breaking into fractional quasiparticles, "listening" to the noise spectrum is a powerful way to decode underlying dynamics. Here, we use ultrasensitive superconducting quantum interference device (SQUIDs) to probe the puzzling noise in a frustrated magnet, the spin-ice compound Dy2Ti2O7 (DTO), revealing cooperative and memory effects. DTO is a topological magnet in three dimensions-characterized by emergent magnetostatics and telltale fractionalized magnetic monopole quasiparticles-whose real-time dynamical properties have been an enigma from the very beginning. We show that DTO exhibits highly anomalous noise spectra, differing significantly

SUBMITTER: Samarakoon AM 

PROVIDER: S-EPMC8812559 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature