电子掺杂LaCoO $_{3}$中Co价态和自旋态的微观研究
Microscopic examinations of Co valences and spin states in electron-doped LaCoO$_{3}$
摘要：
通过X射线吸收光谱和电子自旋共振研究了电子掺杂LaCo $_{1-y}$ Te $_{y}$ O $_3$中Co的价态和自旋态。低温绝缘态包括低自旋Co $^{3+}$（$S=0$）和高自旋Co $^{2+}$态，其由$g=3.8$和$j_{\rm eff}=1/2$描述。的结果，在并发的电子-空穴的不对称性证实在电阻率，符合自旋阻塞现象在这个系统中。此外，我们讨论了$g$因素的强共价键的性质，并考虑这种现象的多个起源。
英文摘要：
We studied the Co valences and spin states in electron-doped LaCo$_{1-y}$Te$_{y}$O$_3$ by measuring x-ray absorption spectra and electron spin resonance. The low-temperature insulating state involves the low-spin Co$^{3+}$ ($S=0$) and the high-spin Co$^{2+}$ state, which is described by $g=3.8$ and $j_{\rm eff}=1/2$. The results, in concurrence with the electron-hole asymmetry confirmed in electrical resistivity, coincide with a spin-blockade phenomenon in this system. Further, we discuss the $g$ factor in terms of the strong covalent-bonding nature and consider multiple origins of this phenomenon.
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