Abstract
Much of the current interest in the ac magnetic susceptibility of dilute magnetic systems, and its variation with static applied magnetic field, was initiated by the series of measurements performed nearly two decades ago by Cannella and Mydosh1 on the AuFe system. Such measurements, carried out at fairly low frequencies (~150 Hz) and driving fields (~5 Oe), revealed the presence of a very sharp cusp in a plot of the ac susceptibility against temperature (near 10 K for a 1 at.% Fe sample) which was rapidly smeared into a rather uninteresting broad maximum by quite modest dc magnetic fields (Ha ≧ 2−300 Oe) applied in a direction parallel to the ac driving field. The principal reason that such a result generated wide interest was because it revealed, for the first time in this type of system, a sharp anomaly in a response function (magnetic, thermal, electrical, etc.) invariably regarded by experimentalists as a signal of a potential phase transition. Indeed, the sharpness of this cusp in the zero field ac magnetic susceptibility (χ(H=O,T)) coupled with the relationship between the latter and the derivatives of the Gibb’s function (G)
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Very recent measurements on undoped CeFe2 (H.P. Kunkel, M.S. Westmore, and G. Williams, Phil. Mag. B (in press)) indicate that a(T) displays a single peak around T c, with no second anomaly at lower temperature.
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Williams, G. (1991). AC Susceptibility of Dilute Magnetic Systems. In: Hein, R.A., Francavilla, T.L., Liebenberg, D.H. (eds) Magnetic Susceptibility of Superconductors and Other Spin Systems. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2379-0_26
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