Ultrafast dynamics in the Lifshitz-type 5d pyrochlore antiferromagnet Cd2Os2O7 | |
Article | |
关键词: ELECTRON; REFLECTIVITY; SPECTROSCOPY; RELAXATION; METAL; | |
DOI : 10.1103/PhysRevB.100.144309 | |
来源: SCIE |
【 摘 要 】
We investigate the ultrafast dynamics of Cd2Os2O7, a prototype material showing a Lifshitz-type transition as a function of temperature. In the paramagnetic metallic state, the photoreflectivity shows a subpicosecond relaxation, followed by a featureless small offset. In the antiferromagnetic state slightly below T-N, however, the photoreflectivity resurges over hundreds of picoseconds, which goes beyond the usual realm of the effective-temperature model. Our observations are consistent with the Lifshitz phase transition of Cd2Os2O7 driven by the evolution of the local magnetic moment.
【 授权许可】
Free