论文标题
LA2NI7的弱磁相弱
Weak itinerant magnetic phases of La2Ni7
论文作者
论文摘要
LA2NI7是一种金属间化合物，被认为具有巡回磁性，小矩订购低于65K。最近对Ribeiro等人对单晶样品进行了研究。 al。 [物理。 Rev. B 105，014412（2022）]确定了详细的各向异性H-T相图，并揭示了T1〜61.0 K，T2〜56.5K和T3〜42 K时的三个零视野磁相变，在该研究中，只有最高温度相显示的最高温度相位才显示出清晰的温度相位。在这里，我们提出了一项单晶中子衍射研究，该研究确定了三个磁有序相的传播载体和磁矩方向，这是温度的函数的两个不一致和一个相应的。较高的温度相具有相似的，不相当的传播载体，但有不同的矩方向。在较低的温度下，作为一阶磁相跃迁的一部分，磁序与沿C方向的磁矩变得相称。我们发现，低温相称的磁顺序与早期DFT计算的建议一致。
La2Ni7 is an intermetallic compound that is thought to have itinerant magnetism with a small moment ordering below 65 K. A recent study of single crystal samples by Ribeiro et. al. [Phys. Rev. B 105, 014412 (2022)] determined detailed anisotropic H-T phase diagrams and revealed three zero-field magnetic phase transitions at T1 ~ 61.0 K, T2 ~ 56.5K, and T3 ~ 42 K. In that study only the highest temperature phase is shown to have a clear ferromagnetic component. Here we present a single crystal neutron diffraction study determining the propagation vector and magnetic moment direction of the three magnetically ordered phases, two incommensurate and one commensurate, as a function of temperature. The higher temperature phases have similar, incommensurate propagation vectors, but with different ordered moment directions. At lower temperatures the magnetic order becomes commensurate with magnetic moments along the c direction as part of a first-order magnetic phase transition. We find that the low-temperature commensurate magnetic order is consistent with a proposal from earlier DFT calculations.
