arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.04572cond-mat.str-elcond-mat.mtrl-sci
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用电子自旋共振研究SmB6中Gd杂质的4f 7 5d 1基态

Revisiting the Possible 4f7 5d1 Ground State of Gd Impurities in SmB6 by Electron Spin Resonance

J. C. Souza, P. F. S. Rosa, U. Burkhardt, M. Konig, Z. Fisk, P. G. Pagliuso, S. Wirth, J. Sichelschmidt

摘要:

对强关联电子系统拓扑态的研究重新引起了人们对近藤绝缘体SmB 6的兴趣。最有趣的先前的结果之一是一个异常的电子自旋共振谱在Gd掺杂的SmB 6。该谱归因于Gd ~(2+)离子,因为它可以很好地用考虑Gd ~(3+)到Gd ~(2+)的价态变化、动态Jahn-Teller效应和哈密顿量中的4f ~ 7 - 5d ~ 1基态的模型描述。在我们的工作中,我们已经重新审视了这种情况下使用电子自旋共振和能量色散X射线光谱测量。我们的研究结果表明,共振产生的Gd 2+离子,然而,共振源于一个外在的氧化物杂质相,位于晶体的表面上。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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