Physics – Condensed Matter
Scientific paper
2002-09-04
Physics
Condensed Matter
5 pages, 4 embedded figures
Scientific paper
10.1103/PhysRevB.66.144424
At low temperatures, spinel CuIr$_2$S$_4$ is a charge-ordered spin-dimerized insulator with triclinic lattice symmetry. We find that x-rays induce a structural transition in which the local triclinic structure is preserved, but the average lattice symmetry becomes tetragonal. These structural changes are accompanied by a thousandfold reduction in the electrical resistivity. The transition is persistent, but the original state can be restored by thermal annealing. We argue that x-ray irradiation disorders the lattice dimerization pattern, producing a state in which the orientation of the dimers is preserved, but the translational long-range order is destroyed.
Borissov A.
Cheong Sang-Wook
Hor Yew San
Horibe Yoichi
Ishibashi Hiromitsu
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