Microscopic examinations of Co valences and spin states in electron-doped LaCoO${}_3$

Abstract

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 $j_{\mathrm{eff}}=1/2$. 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.

7 pages, 5 figures, and 1 table

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• The spin state transition in LaCoO${}_3$; revising a revision
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Cited by in corpus (1)

• Prominent electron-hole asymmetry in thermoelectric transport of LaCoO${}_3$