PrCd$_3$P$_3$中铁弹性相变的拉曼散射光谱观测
Raman scattering spectroscopic observation of a ferroelastic crossover in bond-frustrated PrCd$_3$P$_3$
AI总结：
通过拉曼散射光谱研究PrCd$_3$P$_3$中CdP层的结构不稳定性，揭示Pr$^{3+}$的单重基态及双态能级分裂，推测该材料可通过CdP层的铁电性缓解磁层反铁磁性 frustration。
摘要：
二维磁性在三角晶格中已显示出宿主奇异磁态的潜力。在磁性性质和电荷掺杂方面对这些磁态的控制将是下一步。这使得将三角晶格磁层与具有有趣结构或电子性质的层结合的材料特别有用。本研究中研究的PrCd$_3$P$_3$是其中一种材料，其中三角晶格磁性稀土离子层交替与半导体六方CdP层。利用拉曼散射光谱学，我们揭示了CdP层中的结构不稳定性，与这些层中一个声子的软模行为有关。拉曼散射检测晶体电场激发，并确认Pr$^{3+}$的单重基态以及由于CdP层中的结构不稳定性导致的双态能级分裂。虽然PrCd$_3$P$_3$中Pr$^{3+}$是非磁性的，但我们推测该家族的材料可以通过CdP层实现磁层的控制，该层在应变下可能成为铁电体，从而缓解反铁磁性 frustration。
英文摘要：
2D magnetism in triangular lattices has already shown potential for hosting exotic magnetic states. Control of these magnetic states, both in terms of magnetic properties and in terms of charge doping would be the next step. This makes materials which combine triangular lattice magnetic layers with layers hosting interesting structural or electronic properties particularly useful. PrCd$_3$P$_3$, studied in this work, is one of a family of materials where triangular lattice layers of magnetic rare earth ions alternate with semiconducting hexagonal CdP layers. Using Raman scattering spectroscopy we uncover a structural instability in the CdP layers, associated with a soft mode behavior of a phonon in these layers. Raman scattering detects crystal electric field excitations, and confirms a singlet ground state for Pr$^{3+}$ and splitting of the doublet levels as a result of the structural instability in CdP layers. While Pr$^{3+}$ is non-magnetic in PrCd$_3$P$_3$ we speculate that this family of materials can realize control of the magnetic layer through the CdP layer which can become ferroelectric under strain that would relieve frustration.
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