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arXiv 1503.02813cond-mat.str-el
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X射线光电子能谱学研究SmB6的表面性质

Surface properties of SmB6 from x-ray photoelectron spectroscopy

N. Heming, U. Treske, M. Knupfer, B. Büchner, D. S. Inosov, N. Y. Shitsevalova, V. B. Filipov, S. Krause, A. Koitzsch

摘要:

我们用X射线光电子能谱学研究了解理的$_6$单晶的性质。在低温和新鲜裂解的样品的表面芯能级位移时,观察到的温度升高时消失。从Sm $^{2+}$和Sm $^{3+}$多重峰的相对强度推导出2.5 - 2.6之间的Sm价。从芯能级得到的B/Sm强度比总是大于化学计量值。讨论了这种偏差的可能原因。的B $1s$信号显示出一个意想不到的复杂性:一个异常的低能量组件出现与温度升高,并被分配到在表面形成的低氧化物。虽然几个有趣的内在和外在性能的钐$_6$表面阐明在这份手稿没有明确的迹象表明一个平凡的机制,突出的表面导电性被发现。

英文摘要:

We have investigated the properties of cleaved SmB$_6$ single crystals by x-ray photoelectron spectroscopy. At low temperatures and freshly cleaved samples a surface core level shift is observed which vanishes when the temperature is increased. A Sm valence between 2.5 - 2.6 is derived from the relative intensities of the Sm$^{2+}$ and Sm$^{3+}$ multiplets. The B/Sm intensity ratio obtained from the core levels is always larger than the stoichiometric value. Possible reasons for this deviation are discussed. The B $1s$ signal shows an unexpected complexity: an anomalous low energy component appears with increasing temperature and is assigned to the formation of a suboxide at the surface. While several interesting intrinsic and extrinsic properties of the SmB$_6$ surface are elucidated in this manuscript no clear indication of a trivial mechanism for the prominent surface conductivity is found.

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