Year: 2022
Type: article
Abstract: Magnetically frustrated systems provide fertile ground for complex behaviour, including unconventional ground states with emergent symmetries, topological properties, and exotic excitations. A canonical example is the emergence of magnetic-charge-carrying quasiparticles in spin-ice compounds. Despite extensive work, a reliable experimental indicator of the density of these magnetic monopoles is yet to be found. Using measurements on single crystals of Ho2Ir2O7 combined with dipolar Monte Carlo simulations, we show that the isothermal magnetoresistance is highly sensitive to the monopole density. Moreover, we uncover an unexpected and strong coupling between the monopoles on the holmium sublattice and the antiferromagnetically ordered iridium ions. These results pave the way towards a quantitative experimental measure of monopole density and demonstrate the ability to control antiferromagnetic domain walls using a uniform external magnetic field, a key goal in the design of next-generation spintronic devices.
Source: Nature Communications
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,890
Awards: New correlated electronic states arising from strong spin-orbit coupling, G2318800488, G293229912, G3718860924, Testing Quantumness: From Artificial Quantum Arrays to Lattice Spin Models and Spin Liquids, G434337789, Quantum materials under extreme conditions, Emergence and out-of-equilibrium phenomena in frustrated magnets on pyrochlore lattices, Emergence of novel electronic states in 5d transition metal oxides, Oxford Quantum Materials Platform Grant, G5946578065, Cambridge Theory of Condensed Matter Group -Critical Mass Grant, G7067249157, G7365054132, Harnessing disorder to tune, tailor and design classical and quantum spin liquids, Harnessing disorder to tune, tailor and design classical and quantum spin liquids, DTP 2016-2017 University of Warwick
OpenAlex ID: W4205192599