X-ray-Induced Disordering of the Dimerization Pattern and Apparent Low-Temperature Enhancement of Lattice Symmetry in Spinel CuIr₂S₄
At low temperatures, spinel CuIr2S4 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.
H. Ishibashi et al., "X-ray-Induced Disordering of the Dimerization Pattern and Apparent Low-Temperature Enhancement of Lattice Symmetry in Spinel CuIr₂S₄," Physical Review B (Condensed Matter), vol. 66, no. 14, pp. 1444241 - 1444244, American Physical Society (APS), Oct 2002.
The definitive version is available at https://doi.org/10.1103/PhysRevB.66.144424
Keywords and Phrases
Copper Derivative; Iridium Complex; Sulfur Derivative; Conductance; Conductor; Dimerization; Electric Resistance; Low Temperature Procedures; Superconductor; Temperature Dependence; X Irradiation
International Standard Serial Number (ISSN)
Article - Journal
© 2002 American Physical Society (APS), All rights reserved.
01 Oct 2002