Magnetothermal study of a Dy-stuffed spin ice: Dy 2 ( Dy x Ti 2 − x ) O 7 − x / 2

摘要: We have studied the thermodynamics of stuffed spin ice material, ${\text{Dy}}_{2}({\text{Dy}}_{x}{\text{Ti}}_{2\ensuremath{-}x}){\text{O}}_{7\ensuremath{-}x/2}$, in which additional ${\text{Dy}}^{3+}$ replace ${\text{Ti}}^{4+}$ pyrochlore ${\text{Dy}}_{2}{\text{Ti}}_{2}{\text{O}}_{7}$. Heat capacity measurements indicate that these materials lose zero point entropy for $x\ensuremath{\ge}0.3$, sharply contrasting with results on analogous Ho materials. A finite ac susceptibility is observed as $T\ensuremath{\rightarrow}0$ both and Dy $x=0.67$, suggests fluctuations persist down to $T\ensuremath{\sim}0$. propose data may be explained a result domains local type structural order