Electronic structure calculations for muon spectroscopy
Electronic Structure IOP Publishing (2025)
Muon Studies of Superconductors
Annual Review of Condensed Matter Physics Annual Reviews 16:1 (2025) 367-385
Spiral spin liquid noise.
Proceedings of the National Academy of Sciences of the United States of America 122:12 (2025) e2422498122
Abstract:
An emerging concept for identification of different types of spin liquids [C. Broholm et al., Science 367, eaay0668 (2020)] is through the use of spontaneous spin noise [S. Chatterjee, J. F. Rodriguez-Nieva, E. Demler, Phys. Rev. B 99, 104425 (2019)]. Here, we develop spin noise spectroscopy for spin liquid studies by considering Ca10Cr7O28, a material hypothesized to be either a quantum or a spiral spin liquid (SSL). By enhancing techniques introduced for magnetic monopole noise studies [R. Dusad et al., Nature 571, 234-239 (2019)], we measure the time and temperature dependence of spontaneous flux [Formula: see text] and thus magnetization [Formula: see text] of Ca10Cr7O28 samples. The resulting power spectral density of magnetization noise [Formula: see text] reveals intense spin fluctuations with [Formula: see text] and [Formula: see text]. Both the variance [Formula: see text] and the correlation function [Formula: see text] of this spin noise undergo crossovers at a temperature [Formula: see text]. While predictions for quantum spin liquids are inconsistent with this phenomenology, those from Monte-Carlo simulations of a two-dimensional (2D) SSL state in Ca10Cr7O28 yield overall quantitative correspondence with the measured frequency and temperature dependences of [Formula: see text], and [Formula: see text], thus indicating that Ca10Cr7O28 is an SSL.Field-orientation-dependent magnetic phases in probed with muon-spin spectroscopy
Physical Review B American Physical Society (APS) 111:5 (2025) 54440