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X-ray-induced disordering of the dimerization pattern and apparent low-temperature enhancement of lattice symmetry in spinel CuIr$_2$S$_4$

H. Ishibashi·T. Y. Koo·Y. S. Hor·A. Borissov·Y. Horibe·P. G. Radaelli·S-W. Cheong·V. Kiryukhin
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Abstract

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.

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H. Ishibashi, T. Y. Koo, Y. S. Hor, A. Borissov, Y. Horibe, P. G. Radaelli, S-W. Cheong, V. Kiryukhin. 2002-09-04. X-ray-induced disordering of the dimerization pattern and apparent low-temperature enhancement of lattice symmetry in spinel CuIr$_2$S$_4$. https://doi.org/10.1103/physrevb.66.144424

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