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Stage-2 Cu$_{0.93}$Co$_{0.07}$Cl$_{2}$ graphite intercalation compoundmagnetically behaves like a reentrant ferromagnet near the multicritical point($c_{MCP} \approx 0.96$). It undergoes two magnetic phase transitions at$T_{RSG}$ ($= 6.64 \pm 0.05$ K) and $T_{c}$ ($= 8.62 \pm 0.05$ K). The staticand dynamic nature of the ferromagnetic and reentrant spin glass phase has beenstudied using DC and AC magnetic susceptibility. Characteristic memoryphenomena of the DC susceptibility are observed at $T_{RSG}$ and $T_{c}$. Thenonlinear AC susceptibility $\chi_{3}^{\prime}$ has a positive local maximum at$T_{RSG}$, and a negative local minimum at $T_{c}$. The relaxation time $\tau$between $T_{RSG}$ and $T_{c}$ shows a critical slowing down: $\tau$ with $x =13.1 \pm 0.4$ and $\tau_{0}^{*} = (2.5 \pm 0.5) \times 10^{-13}$ sec. Theinfluence of the random disorder on the critical behavior above $T_{c}$ isclearly observed: $\alpha = -0.66$, $\beta = 0.63$, and $\gamma = 1.40$. Theexponent of $\alpha$ is far from that of 3D Heisenberg model.Comment: 15 pages, 16 figures, submitted to Phys. Rev.

physical review. b, condensed matter and materials physics

Effect of random disorder and spin frustration on the reentrant spin-glass and ferromagnetic phases in the stage-2<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>0.93</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:mn>0.07</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cl</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>graphite intercalation compound near…

Effect of random disorder and spin frustration on the reentrant spin-glass and ferromagnetic phases in the stage-2Cu0.93Co0.07Cl2graphite intercalation compound near…