Abstract
The dynamic scaling behavior of the Ising spin glass F${\mathrm{e}}_{0.5}$M${\mathrm{n}}_{0.5}$Ti${\mathrm{O}}_{3}$ in superimposed dc magnetic fields has been studied. The dynamic freezing temperatures ${T}_{f}\left(\ensuremath{\omega},H\right)$ were determined as a function of field $0\ensuremath{\le}H\ensuremath{\le}3.1$ T and frequency $0.017\ensuremath{\le}\ensuremath{\omega}/2\ensuremath{\pi}\ensuremath{\le}5100$ Hz. The in-field scaling behavior is strikingly different from the zero-field behavior and is well described by activated dynamics and a correlation length that depends on field as $\ensuremath{\xi}\ensuremath{\propto}{H}^{\ensuremath{-}{\ensuremath{\nu}}_{H}}$. The results are in agreement with the droplet model predictions and strongly suggest that there is no phase transition in a magnetic field in 3D Ising spin glasses.
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