标题： 稀释自旋冰（Dy$_{1-x}$Y$_x$)$_2$Ti$_2$O$_7$中Pauling残余熵的抑制 显示英文标题

标题： Suppression of Pauling's Residual Entropy in Dilute Spin Ice (Dy$_{1-x}$Y$_x$)$_2$Ti$_2$O$_7$

摘要： 在约0.5 K时，自旋冰 Dy$_2$Ti$_2$O$_7$的熵呈现出接近保罗林原始用于水冰的残余熵的平台状特征，但由于超慢的热平衡，无法在更低温度下进行明确的量化。 基于(Dy$_{1-x}$Y$_x$)$_2$Ti$_2$O$_7$的比热数据，我们分析了非磁性稀释对低温熵的影响。 随着x的增加，超慢热平衡迅速消失，低温熵系统性减少且其温度依赖性显著增强。 这些数据表明，在(Dy$_{1-x}$Y$_x$)$_2$Ti$_2$O$_7$中，实现了非简并的基态，适用于中等稀释情况。 这与从Pauling理论推广得到的预期零温残留熵相矛盾，但得到了蒙特卡罗模拟的支持。 显示英文摘要

摘要： Around 0.5 K, the entropy of the spin-ice Dy$_2$Ti$_2$O$_7$ has a plateau-like feature close to Pauling's residual entropy derived originally for water ice, but an unambiguous quantification towards lower temperature is prevented by ultra-slow thermal equilibration. Based on specific heat data of (Dy$_{1-x}$Y$_x$)$_2$Ti$_2$O$_7$ we analyze the influence of non-magnetic dilution on the low-temperature entropy. With increasing x, the ultra-slow thermal equilibration rapidly vanishes, the low-temperature entropy systematically decreases and its temperature dependence strongly increases. These data suggest that a non-degenerate ground state is realized in (Dy$_{1-x}$Y$_x$)$_2$Ti$_2$O$_7$ for intermediate dilution. This contradicts the expected zero-temperature residual entropy obtained from a generalization of Pauling's theory for dilute spin ice, but is supported by Monte Carlo simulations.