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Deepak Roy

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Research paper thumbnail of Evolution of the structural, magnetic, and electronic properties of the triple perovskite Ba3CoIr2O9

Physical Review B, 2021

We report a comprehensive investigation of the triple perovskite iridate Ba3CoIr2O9. Stabilizing ... more We report a comprehensive investigation of the triple perovskite iridate Ba3CoIr2O9. Stabilizing in the hexagonal P 63/mmc symmetry at room temperature, this system transforms to a monoclinic C2/c symmetry at the magnetic phase transition. On further reduction in temperature, the system partially distorts to an even lower symmetry (P 2/c), with both these structurally disparate phases coexisting down to the lowest measured temperatures. The magnetic structure as determined from neutron diffraction data indicates a weakly canted antiferromagnetic structure, which is also supported by first-principles calculations. Theory indicates that the Ir 5+ carries a finite magnetic moment, which is also consistent with the neutron data. This suggests that the putative J = 0 state is avoided. Measurements of heat capacity, electrical resistance noise and dielectric susceptibility all point towards the stabilization of a highly correlated ground state in the Ba3CoIr2O9 system.

Research paper thumbnail of Evolution of the structural, magnetic, and electronic properties of the triple perovskite Ba3CoIr2O9

Physical Review B, 2021

We report a comprehensive investigation of the triple perovskite iridate Ba3CoIr2O9. Stabilizing ... more We report a comprehensive investigation of the triple perovskite iridate Ba3CoIr2O9. Stabilizing in the hexagonal P 63/mmc symmetry at room temperature, this system transforms to a monoclinic C2/c symmetry at the magnetic phase transition. On further reduction in temperature, the system partially distorts to an even lower symmetry (P 2/c), with both these structurally disparate phases coexisting down to the lowest measured temperatures. The magnetic structure as determined from neutron diffraction data indicates a weakly canted antiferromagnetic structure, which is also supported by first-principles calculations. Theory indicates that the Ir 5+ carries a finite magnetic moment, which is also consistent with the neutron data. This suggests that the putative J = 0 state is avoided. Measurements of heat capacity, electrical resistance noise and dielectric susceptibility all point towards the stabilization of a highly correlated ground state in the Ba3CoIr2O9 system.

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