Mesoscopic phase separation in Na$_x$CoO$_2$ ($0.65\leq x\leq 0.75$)

Details Mesoscopic phase separation in Na$_x$CoO$_2$ ($0.65\leq x\leq 0.75$) Mesoscopic phase separation in Na$_x$CoO$_2$ ($0.65\leq x\leq 0.75$)

2003-12-11

arxiv.org/abs/cond-mat/0312284v1

Physics

Condensed Matter

Strongly Correlated Electrons

14 figures

Scientific paper

10.1103/PhysRevB.70.024409

NMR, EPR and magnetization measurements in Na$_x$CoO$_2$ for $0.65\leq x\leq 0.75$ are presented. While the EPR signal arises from Co$^{4+}$ magnetic moments ordering at $T_c\simeq 26$ K, $^{59}$Co NMR signal originates from cobalt nuclei in metallic regions with no long range magnetic order and characterized by a generalized susceptibility typical of strongly correlated metallic systems. This phase separation in metallic and magnetic insulating regions is argued to occur below $T^*(x)$ ($220 - 270$ K). Above $T^*$ an anomalous decrease in the intensity of the EPR signal is observed and associated with the delocalization of the electrons which for $T

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