2026-10-11T13:36:59Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33881872 2026-09-17T09:52:18Z portal_1197 item_type_3 month_year_09_2026

Data for Magnetotransport of Sm2Ir2O7 across the pressure-induced quantum-critical phase boundary Paul Goddard (564595) Rare earth metals -- Magnetic properties Magnetism Transport theory Tetrahedra Magnetoresistance Electron transport Migrated from ePrints Rare-earth pyrochlore iridates host two interlocking magnetic sublattices of corner-sharing tetrahedra and can harbour a unique combination of frustrated moments, exotic excitations and highly correlated electrons. 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. The magnetotransport does track the suppression of Ir magnetism, however, with a strong hysteresis observed only within the AIAO phase boundary, similar to that found for Ho2Ir2O7 and attributed to plastic deformation of Ir domains. Around pc we �find the emergence of a new type of electronic phase, characterized by a negative magnetoresistance with small hysteresis at the lowest temperatures, and hysteresis-free positive magnetoresistance above approximately 5 K. The temperature dependence of our low-temperature transport data are found to be best described by a model consistent with a Weyl semimetal across the entire pressure range. 2024-01-01T00:00:00Z Dataset Dataset 10.82444/warw.33881872.v1 https://figshare.com/articles/dataset/Data_for_Magnetotransport_of_Sm2Ir2O7_across_the_pressure-induced_quantum-critical_phase_boundary/33881872 CC BY 4.0