量子自旋冰中的晶体场态]{候选量子自旋冰中Pr $^{3+}$的晶体场态Pr $_{2}$ Sn $_{2}$ O $_{7}$
Crystal field states in a Quantum Spin Ice]{Crystal field states of Pr$^{3+}$ in the candidate quantum spin ice Pr$_{2}$Sn$_{2}$O$_{7}$
摘要：
用中子飞行时间谱研究了焦绿石锡酸盐Pr $_{2}$ Sn $_{2}$ O $_{7}$中Pr $^{3+}$的晶场分裂。晶体场已被参数化的配置文件适合所观察到的中子谱。的单离子基态是一个很好的隔离非Kramers双峰的$Γ_3^+$对称性与一个大的Ising样的各向异性，$χ_{zz} /χ_\perp \approx 60$在10 K，但与一个显着的混合物的条款$| M_J \neq \pm J >$，可以引起量子零点波动。这种磁性状态满足量子自旋冰行为的要求。
英文摘要：
Neutron time-of-flight spectroscopy has been employed to study the crystal-field splitting of Pr$^{3+}$ in the pyrochlore stannate Pr$_{2}$Sn$_{2}$O$_{7}$. The crystal field has been parameterized from a profile fit to the observed neutron spectrum. The single-ion ground state is a well isolated non-Kramers doublet of $Γ_3^+$ symmetry with a large Ising-like anisotropy, $χ_{zz} /χ_\perp \approx 60$ at 10 K, but with a significant admixture of terms $| M_J \neq \pm J >$ which can give rise to quantum zero-point fluctuations. This magnetic state satisfies the requirements for quantum spin ice behavior.
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