Topological metamagnetism: thermodynamics and dynamics of the transition in a frustrated magnet under uniaxial compression

S. A. GRIGERA

Workshop; Workshop on Topological Quantum Matter, Universidad Nacional de San Martı́n and Karlsruhe Institute of Technology,; 2022

Metamagnetic transitions are analogues of a pressure driven gas-liquid transitionin water. In insulators, they are marked by a super-linear increase in the mag-netisation that occurs at a field strength set by the spin exchange interactions. In this talk I will discuss experiments in topological metamagnets, where themagnetisation is itself a topological quantity, and where we find a single tran-sition line for two materials with substantially different magnetic interactions:the spin-ices Dy2Ti2O7 and Ho2Ti2O7. In addition to the study of single crystals under magnetic field we will discussin the talk the effect of stress applied along the [001] direction. It will be shownthat the dynamical response of Ho2Ti2O7 is sensitive to changes in the Ho3+environment induced by compression along [001].