量子自旋冰候选体Pr $_2$ Zr $_2$ O $_7$中动态晶格效应对晶场激发的重要性
Importance of dynamic lattice effects for crystal field excitations in quantum spin ice candidate Pr$_2$Zr$_2$O$_7$
摘要：
Pr $_2$ Zr $_2$ O $_7$是烧绿石量子自旋冰候选物。使用拉曼散射光谱，我们探测晶体电场激发的Pr $^{3+}$，并证明其与晶格的相互作用的重要性。我们确定了一个振动相互作用的声子，导致分裂的双重晶场激发在约55 meV。我们还探测分裂的非Kramers基态的双重Pr $^{3+}$通过观察双线的第一激发单重态$E^0_g \rightarrow A_{1g}$的激发。我们发现，分裂有很强的温度依赖性，与双峰结构最突出的50~K和100~K之间，其中一个组件的重量强烈减少冷却。我们建议从理想的晶体结构中的位置的Pr $^{3+}$的静态或动态的偏差可以是效果的起源，在低温下的偏差强烈降低。
英文摘要：
Pr$_2$Zr$_2$O$_7$ is a pyrochlore quantum spin-ice candidate. Using Raman scattering spectroscopy we probe crystal electric field excitations of Pr$^{3+}$, and demonstrate the importance of their interactions with the lattice. We identify a vibronic interaction with a phonon that leads to a splitting of a doublet crystal field excitation at around 55~meV. We also probe a splitting of the non-Kramers ground state doublet of Pr$^{3+}$ by observing a double line of the excitations to the first excited singlet state $E^0_g \rightarrow A_{1g}$. We show that the splitting has a strong temperature dependence, with the doublet structure most prominent between 50~K and 100~K, and the weight of one of the components strongly decreases on cooling. We suggest a static or dynamic deviation of Pr$^{3+}$ from the position in the ideal crystal structure can be the origin of the effect, with the deviation strongly decreasing at low temperatures.
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