Enhancement of the Peierls-like phase transition in the Cu1−xLixIr2S4 system
Lei Zhang1a, Langsheng Ling1, Zhe Qu1, Changjin Zhang1, Shun Tan2 and Yuheng Zhang1,2
High Magnetic Field Laboratory, Chinese Academy of Sciences - Hefei 230031, PRC
2 High Magnetic Field Laboratory, University of Science and Technology of China - Hefei 230026, PRC
Accepted: 30 March 2011
In the spinel CuIr2S4 system, previous reports have shown that any chemical substitution would suppress or destroy the Peierls-like phase transition. Herein, we present our investigations on the Cu1−xLixIr2S4 system, where the Peierls-like phase transition is enhanced by the doping of Li. To our knowledge, this is the first report that the phase transition is enhanced by chemical substitution. Through low-temperature X-ray diffraction study, we find that the lattice cell is distorted by the doping of Li, which favors the tetragonal structure in the low-temperature Peierls-like phase. We suggest that the lattice distortion caused by the Li-doping is responsible for the enhancement of the phase transition.
PACS: 71.30.+h – Metal-insulator transitions and other electronic transitions / 72.80.Ga – Transition-metal compounds / 75.20.-g – Diamagnetism, paramagnetism, and superparamagnetism
© EPLA, 2011