Infrared study of the electronic structure of metallic pyrochlore iridate Bi$_2$Ir$_2$O$_7$
Infrared study of the electronic structure of metallic pyrochlore iridate Bi$_2$Ir$_2$O$_7$
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DOI：
10.1103/physrevb.87.195143
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发表时间：
2013-03
期刊：
影响因子：
--
通讯作者：
Yunsang Lee;S. Moon;S. Riggs;M. Shapiro;I. Fisher;A. Kemper;D. Basov
中科院分区：
文献类型：
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作者：
Yunsang Lee;S. Moon;S. Riggs;M. Shapiro;I. Fisher;A. Kemper;D. Basov
We investigated the electronic properties of a single crystal of metallic pyrochlore iridate Bi${}_{2}$Ir${}_{2}$O${}_{7}$ by means of infrared spectroscopy. Our optical conductivity data show the splitting of ${t}_{2g}$ bands into ${J}_{\mathrm{eff}}$ ones due to strong spin-orbit coupling. We observed a sizable midinfrared absorption near 0.2 eV which can be attributed to the optical transition within the ${J}_{\mathrm{eff},1/2}$ bands. More interestingly, we found an abrupt suppression of optical conductivity in the very far-infrared region. Our results suggest that the electronic structure of Bi${}_{2}$Ir${}_{2}$O${}_{7}$ is governed by the strong spin-orbit coupling and correlation effects, which are a prerequisite for theoretically proposed nontrivial topological phases in pyrochlore iridates.
We investigated the electronic properties of a single crystal of metallic pyrochlore iridate Bi${}_{2}$Ir${}_{2}$O${}_{7}$ by means of infrared spectroscopy. Our optical conductivity data show the splitting of ${t}_{2g}$ bands into ${J}_{\mathrm{eff}}$ ones due to strong spin-orbit coupling. We observed a sizable midinfrared absorption near 0.2 eV which can be attributed to the optical transition within the ${J}_{\mathrm{eff},1/2}$ bands. More interestingly, we found an abrupt suppression of optical conductivity in the very far-infrared region. Our results suggest that the electronic structure of Bi${}_{2}$Ir${}_{2}$O${}_{7}$ is governed by the strong spin-orbit coupling and correlation effects, which are a prerequisite for theoretically proposed nontrivial topological phases in pyrochlore iridates.