Abstract
We report the first measurements of both the linear and non-linear magnetic response of a “re-entrant” system, (Pd+0.35 at% Fe)+5 at % Mn, in the vicinity of both the upper and lower “candidate” transitions. The upper transition has been identified as a well defined paramagnetic-ferromagnetic transition; the associated critical exponents have been found from the field and temperature dependence of the cross-over line above T c. An anomaly in the non-linear response has been observed for the first time in the vicinity of the lower transition (located near the temperature at which the initial susceptibility falls abruptly). This anomaly takes the form of a distinct, but clearly not divergent, peak in the temperature dependence of the coefficient of the H 2 term in the susceptibility. Such behaviour is a strong indication of a re-entrant ferromagnetic-spin glass transition.
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