Magnetic field dependence of the Schottky anomaly in filled skutterudites Pr 1 − x Eu x Pt 4 Ge 12

摘要: By performing a series of thermodynamic measurements in an applied magnetic field ${H}_{\mathrm{ext}}$, we investigated the effects Eu substitution on Pr sites filled skutterudite compound ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Eu}}_{x}{\mathrm{Pt}}_{4}{\mathrm{Ge}}_{12}$ ($0\ensuremath{\le}x\ensuremath{\le}1$). A heat capacity Schottky anomaly is present over whole doping range. For samples with $xg0.5$, temperature maximum, ${T}_{max}$, shifts to lower increasing ${H}_{\mathrm{ext}}$. We argue that this behavior reflects antiferromagnetic (AFM) ordering moments, as AFM transition suppressed by The $x\ensuremath{\le}0.5$ higher temperatures field, signaling presence internal due short-range correlations induced moments neighboring sites. In low gaps show nonlinear relationship ${H}_{\mathrm{ext}}$ become weakly magnetized. high completely aligned Thus, does not further increase magnetization; hence linearly