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Strain applied to a condensed-matter system can be used to engineer itsexcitation spectrum via artificial gauge fields, or it may tune the systemthrough transitions between different phases. Here we demonstrate that straintuning of the ground state of otherwise highly degenerate frustrated systemscan induce novel phases, both ordered and disordered. For the classicalHeisenberg antiferromagnet on the kagome lattice, we show that weak triaxialstrain reduces the degeneracies of the system, leading to a classical spinliquid with non-coplanar configurations, while stronger strain drives thesystem into a highly unconventional state which displays signatures of bothspin-glass behavior and magnetic long-range order. We provide experimentallytestable predictions for the magnetic structure factor, characterize theground-state degeneracies and the excitation spectrum, and analyze theinfluence of sample shape and boundaries. Our work opens the way to strainengineering of highly frustrated magnets.

Strain tuning of highly frustrated magnets: Order and disorder in the distorted kagome Heisenberg antiferromagnet