# Magnetic and Electronic Properties of Li$x$CoO$2$ Single Crystals - Condensed Matter > Strongly Correlated Electrons

Magnetic and Electronic Properties of Li$x$CoO$2$ Single Crystals - Condensed Matter > Strongly Correlated Electrons - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

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}$$\sim155 K, a sharp anomaly is observed in the ho$$-$$T, M$$-$$T andC$$-$$T$$-$$T curves for x=0.66 with thermal hysteresis, indicating thefirst-order charactor of the transition. The transition at T { m S}$$\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 $T { m S}$.

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

Fuente: https://arxiv.org/