X-ray-induced disordering of the dimerization pattern and apparent low-temperature enhancement of lattice symmetry in spinel
- 31 October 2002
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 66 (14), 144424
- https://doi.org/10.1103/physrevb.66.144424
Abstract
At low temperatures, spinel 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.
Keywords
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