期刊
PHYSICAL REVIEW B
卷 103, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.014437
关键词
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资金
- DST India [INT/FRG/DAAD/P-249/2015]
- DST Nanomission Thematic Unit Program [SR/NM/TP-13/2016]
- Department of Science and Technology, India [SR/NM/Z-07/2015]
- Council of Scientific and Industrial Research (CSIR), Government of India
A comprehensive investigation of the triple perovskite iridate Ba3CoIr2O9 revealed structural and magnetic transitions at different temperatures, stabilizing in a highly correlated ground state. The system exhibited coexisting structurally disparate phases at low temperatures, with a weakly canted antiferromagnetic structure supported by first-principles calculations and neutron data.
We report a comprehensive investigation of the triple perovskite iridate Ba3CoIr2O9. Stabilizing in the hexagonal P6(3)/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 (P2/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 Ir5+ 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 toward the stabilization of a highly correlated ground state in the Ba3CoIr2O9 system.
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