2024/05/13 by M. Rosalin, Rosalin, M, K. A. Irshad +13
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Nuclear materials and radiation effects #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.2405.07607
openalex publication_date 2024/05/13 · openalex created_date 2024/05/15 · openalex updated_date 2026/07/28
The pyrochlore iridates, A2Ir2O7, show a wide variety of structural, electronic, and magnetic properties controlled by the interplay of different exchange interactions, which can be tuned by external pressure. In this work, we report pressure-induced phase transitions at ambient temperature using synchrotron-based X-ray diffraction (up to ~ 20 GPa) and Raman-scattering measurements (up to ~ 25 GPa) of the pyrochlore series (Sm1-xBix)2Ir2O7 (x = 0, 0.02, and 0.10). Our Raman and X-ray data suggest an iso-structural transition in Sm2Ir2O7 at Pc ~ 11.2 GPa associated with the rearrangement of IrO6 octahedra in the pyrochlore lattice. The transition pressure decreases to ~ 10.2 and 9 GPa for x = 0.02 and 0.10, respectively. For all the samples, the linewidth of three phonons associated with Ir-O-Ir (A1g and Eg) and Ir-O (T2g4) vibrations show anomalous decrease up to Pc, due to decrease in electron-phonon interaction.