Magnetic and Electronic Properties of Li$ x$CoO$ 2$ Single Crystals - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: Measurements of electrical resistivity $ ho$, DC magnetization $M$ andspecific heat $C$ have been performed on layered oxide Li$ x$CoO$ 2$0.25$\leq$$x$$\leq$0.99 using single crystal specimens. The $ ho$ versustemperature $T$ curve for $x$=0.90 and 0.99 is found to be insulating but ametallic behavior is observed for 0.25$\leq$$x$$\leq$0.71. At $T { mS}$$\sim$155 K, a sharp anomaly is observed in the $ ho$$-$$T$, $M$$-$$T$ and$C$$-$$T$$-$$T$ curves for $x$=0.66 with thermal hysteresis, indicating thefirst-order charactor of the transition. The transition at $T { m S}$$\sim$155K is observed for the wide range of $x$=0.46$-$0.71. It is found that the$M$$-$$T$ curve measured after rapid cool becomes different from that afterslow cool below $T { m F}$, which is $\sim$130 K for $x$=0.46$-$0.71. $T { mF}$ is found to agree with the temperature at which the motional narrowing inthe $^7$Li NMR line width is observed, indicating that the Li ions stopdiffusing and order at the regular site below $T { m F}$. The ordering of Liions below $T { m F}$$\sim$130 K is likely to be triggered and stabilized bythe charge ordering in CoO$ 2$ layers below $T { m S}$.



Author: K. Miyoshi, C. Iwai, H. Kondo, M. Miura, S. Nishigori, J. Takeuchi

Source: https://arxiv.org/







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