论文标题
通过电子自旋共振来重新访问SMB6中可能的4F7 5D1的GD杂质的基态
Revisiting the Possible 4f7 5d1 Ground State of Gd Impurities in SmB6 by Electron Spin Resonance
论文作者
论文摘要
在密切相关的电子系统中寻找拓扑状态的搜索使人们对近托绝缘子SMB6的兴趣更新了。先前最吸引人的结果之一是GD掺杂的SMB6中的异常电子自旋谐振光谱。该频谱归因于GD2+离子，因为考虑到从GD3+到GD2+的变化，动态的Jahn-Teller效应和Hamiltonian中的4F7 5D1接地状态，它可能会很好地降低它。在我们的工作中，我们使用电子自旋共振和能量色散X射线光谱测量来重新审视了这种情况。我们的结果表明，共振是由GD2+离子产生的。然而，共振源于外在的氧化物杂质阶段，位于晶体表面。
The search for topological states in strongly correlated electron systems has renewed the interest in the Kondo insulator SmB6. One of the most intriguing previous results was an anomalous electron spin resonance spectrum in Gd-doped SmB6. This spectrum was attributed to Gd2+ ions because it could be very well decribed by a model considering a change in the valence from Gd3+ to Gd2+, a dynamic Jahn-Teller effect and a 4f7 5d1 ground state in the Hamiltonian. In our work, we have revisited this scenario using electron spin resonance and energy dispersive X-ray spectroscopy measurements. Our results suggest that the resonance is produced by Gd2+ ions; however the resonance stems from an extrinsic oxide impurity phase that lies on the surface of the crystal.
