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Static and dynamic behavior of short-range Ising-spin glassCu$_{0.5}$Co$_{0.5}$Cl$_{2}$-FeCl$_{3}$ graphite bi-intercalation compounds(GBIC) has been studied with SQUID DC and AC magnetic susceptibility. The $T$dependence of the zero-field relaxation time $\tau$ above a spin-freezingtemperature $T_{g}$ (= 3.92 $\pm$ 0.11 K) is well described by critical slowingdown. The absorption $\chi^{\prime\prime}$ below $T_{g}$ decreases withincreasing angular frequency $\omega$, which is in contrast to the case of 3DIsing spin glass. The dynamic freezing temperature $T_{f}(H,\omega)$ at whichd$M_{FC}(T,H)/$d$H=\chi^{\prime}(T,H=0,\omega)$, is determined as a function offrequency (0.01 Hz $\leq \omega/2\pi \leq$ 1 kHz) and magnetic field (0 $\leq H\leq$ 5 kOe). The dynamic scaling analysis of the relaxation time $\tau(T,H)$defined as $\tau = 1/\omega$ at $T = T_{f}(H,\omega)$ suggests the absence ofSG phase in the presence of $H$ (at least above 100 Oe). Dynamic scalinganalysis of $\chi^{\prime \prime}(T, \omega)$ and $\tau(T,H)$ near $T_{g}$leads to the critical exponents ($\beta$ = 0.36 $\pm$ 0.03, $\gamma$ = 3.5$\pm$ 0.4, $\nu$ = 1.4 $\pm$ 0.2, $z$ = 6.6 $\pm$ 1.2, $\psi$ = 0.24 $\pm$0.02, and $\theta$ = 0.13 $\pm$ 0.02). The aging phenomenon is studied throughthe absorption $\chi^{\prime \prime}(\omega, t)$ below $T_{g}$. It obeys a$(\omega t)^{-b^{\prime \prime}}$ power-law decay with an exponent $b^{\prime\prime}\approx 0.15 - 0.2$. The rejuvenation effect is also observed undersufficiently large (temperature and magnetic-field) perturbations.Comment: 14 pages, 19 figures; to be published in Phys. Rev. B (September 1,  2003

physical review. b, condensed matter

Dynamic scaling and aging phenomena in a short-range Ising spin glass:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Co</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cl</mml:…

Dynamic scaling and aging phenomena in a short-range Ising spin glass:Cu0.5Co0.5Cl