Data for Magnetotransport of Sm2Ir2O7 across the pressure-induced quantum-critical phase boundary

They are also the �first systems predicted to display both topological Weyl semimetal and axion insulator phases. We have measured the transport and magnetotransport properties of single-crystal Sm2Ir2O7 up to and beyond the pressure-induced quantum critical point for all-in-all-out (AIAO) Ir order at p_c = 63 kbar previously identi�fied by resonant X-ray scattering and close to which Weyl semimetallic behavior has been previously predicted.

Our fi�ndings overturn the accepted expectation that the suppression of AIAO order should lead to metallic conduction persisting down to zero temperature. Instead, the resistivity-minimum temperature, which tracks the decrease in the AIAO ordering temperature for pressures up to 30 kbar, begins to increase under further application of pressure, pointing to the presence of a second as-yet unidentifi�ed mechanism leading to non-metallic behavior.