High-energy electronic excitations in Sr 2 IrO 4 observed by Raman scattering
High-energy electronic excitations in Sr 2 IrO 4 observed by Raman scattering
复制标题
通过拉曼散射观察到 Sr 2 IrO 4 中的高能电子激发
DOI：
10.1103/physrevb.91.195140
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发表时间：
2014
影响因子：
3.7
通讯作者：
D. Reznik
中科院分区：
文献类型：
--
作者：
Jhih;Yi;M. Hermele;T. Qi;G. Cao;D. Reznik
Spin-orbit interaction in ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$ leads to the realization of the ${J}_{\mathrm{eff}}=1/2$ state and also induces an insulating behavior. Using large-shift Raman spectroscopy, we found two high-energy excitations of the $d$-shell multiplet at 690 and 680 meV with ${A}_{1g}$ and ${B}_{1g}$ symmetry, respectively. As temperature decreases, the ${A}_{1g}$ and ${B}_{1g}$ peaks narrow, and the ${A}_{1g}$ peak shifts to higher energy while the energy of the ${B}_{1g}$ peak remains the same. When $25%$ of Ir is substituted with Rh the ${A}_{1g}$ peak softens by $10%$ but the ${B}_{1g}$ peak does not. We show that both pseudospin-flip and non-pseudo-spin-flip d-d electronic transitions are Raman active, but only the latter are observed. Our experiments and analysis place significant new constraints on the possible electronic structure of ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$.
Spin-orbit interaction in ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$ leads to the realization of the ${J}_{\mathrm{eff}}=1/2$ state and also induces an insulating behavior. Using large-shift Raman spectroscopy, we found two high-energy excitations of the $d$-shell multiplet at 690 and 680 meV with ${A}_{1g}$ and ${B}_{1g}$ symmetry, respectively. As temperature decreases, the ${A}_{1g}$ and ${B}_{1g}$ peaks narrow, and the ${A}_{1g}$ peak shifts to higher energy while the energy of the ${B}_{1g}$ peak remains the same. When $25%$ of Ir is substituted with Rh the ${A}_{1g}$ peak softens by $10%$ but the ${B}_{1g}$ peak does not. We show that both pseudospin-flip and non-pseudo-spin-flip d-d electronic transitions are Raman active, but only the latter are observed. Our experiments and analysis place significant new constraints on the possible electronic structure of ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$.
影响因子：
16.6
作者：
Kim, Jungho;Daghofer, M.;Kim, B. J.
通讯作者：
Kim, B. J.