Raman Scattering Investigation of a New Candidate for a Quantum Spin Liquid, the Magnetic Insulator, Ba₃Ir₄O₁₀

The insulator Ba₃Ir₄O₁₀ is a new candidate for a frustrated quantum spin liquid, which was reported to have a stabilized quantum spin liquid state down to 0.2 K. The frustration parameter of around 3800 is extremely high. The spin liquid is also extraordinarily sensitive to changes in the lattice parameters as shown with the effects from strontium doping. The replacement of approximately 2% of barium with strontium readily lifts the frustration parameter and this doped material has long-range order from an antiferromagnetic transition at 130 K. Raman spectroscopy results show that both materials are also strongly anisotropic. We will present a comparison of the results of Raman scattering experiments on Sr-doped and undoped samples of Ba₃Ir₄O₁₀.