Ce3TiBi5和Ce3ZrBi5的磁序与激发
Magnetic order and excitations in Ce$_3$TiBi$_5$ and Ce$_3$ZrBi$_5$
AI总结：
研究通过中子散射揭示Ce3TiBi5和Ce3ZrBi5中非共轭环状反铁磁序及Kondo杂化效应。
摘要：
R3MBi5类稀土金属间化合物（R为稀土元素，M为Ti、Zr、Sc）提供了一个 versatile 的平台，用于探索Kondo杂化、RKKY交换、磁性 frustrated 和破除反演对称性如何合作产生异常磁性行为。我们对Ce3TiBi5和Ce3ZrBi5这两种局部非中心对称的Kondo-晶格化合物的磁结构、晶电场（CEF）和低能激发进行了全面的中子散射研究。粉末和单晶中子衍射显示，Ce3TiBi5中存在非共轭的环状反铁磁序，传播矢量k = (0, 0, 0.388)，有序矩为m = 0.53(3)μB。Ce3ZrBi5表现出相似的磁性衍射图谱，k ≃ (0, 0, 0.37)。非弹性中子散射测量揭示了两种化合物中两个清晰且分离的CEF激发，其轮廓几乎相同，证实了Kramers双重态的孤立基态。在低能范围内，观察到T ≃ TN的宽泛准弹性磁响应，其动量依赖性与局部化矩的常规集体激发预期不一致。这种不一致，加上Kondo温度估计TK ~ 3-5 K，与TN相当，表明显著的Kondo杂化，这解释了矩的减少和似乎涉及磁硬方向的螺旋磁序。我们的结果将这些化合物置于一个区域，其中局部反演对称性破缺、各向异性CEF效应以及竞争的Kondo和RKKY相互作用共同导致了非传统的磁序。
英文摘要：
The R3MBi5 rare-earth intermetallics (R = rare earth, M = Ti, Zr, Sc) provide a versatile platform to explore how Kondo hybridization, RKKY exchange, magnetic frustration, and broken inversion symmetry may cooperate to generate unusual magnetic behavior. We present a comprehensive neutron scattering investigation of the magnetic structure, crystal electric field (CEF), and low-energy excitations in the locally noncentrosymmetric Kondo-lattice compounds Ce3TiBi5 and Ce3ZrBi5. Powder and single-crystal neutron diffraction reveals incommensurate cycloidal antiferromagnetic order in Ce3TiBi5 with propagation vector k = (0, 0, 0.388) and a reduced ordered moment of m = 0.53(3)$μ_{B}$. Ce3ZrBi5 exhibits a qualitatively similar magnetic diffraction profile, with k $\simeq$ (0, 0, 0.37). Inelastic neutron scattering measurements resolve two clear, well-separated CEF excitations in both compounds with nearly the same profile, confirming a well-isolated Kramers doublet ground state. At low energies, a broad, quasi-elastic magnetic response is observed at T $\simeq$ TN, whose momentum-dependence is inconsistent with that expected from conventional collective excitations of localized moments. This discrepancy, along with a Kondo temperature estimate TK ~ 3--5 K -- comparable to TN -- indicates sizable Kondo hybridization, which accounts for the moment reduction and the spiral magnetic order that appears to involve the magnetic hard direction. Our results place these compounds in a regime where local inversion symmetry breaking, anisotropic CEF effects, and competing Kondo and RKKY interactions collectively give rise to unconventional magnetic order.
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