Distinct order of Gd 4f and Fe 3d moments coexisting in GdFe4Al8

Article

关键词: RAY MAGNETIC SCATTERING;    SINGLE-CRYSTALS;    NEUTRON-DIFFRACTION;    RFE4AL8;    GROWTH;    MAGNETORESISTANCE;    POLARIZATION;    EXCHANGE;    SYSTEMS;    LA;   

DOI  :  10.1103/PhysRevB.72.174407

来源: SCIE

【 摘 要 】

Single crystals of flux-grown tetragonal GdFe4Al8 were characterized by thermodynamic, transport, and x-ray resonant magnetic scattering measurements. In addition to antiferromagnetic order at T(N)approximate to 155 K, two low-temperature transitions at T(1)approximate to 21 K and T(2)approximate to 27 K were identified. The Fe moments order at T-N with an incommensurate propagation vector (tau,tau,0) with tau varying between 0.06 and 0.14 as a function of temperature, and maintain this order over the entire T < T-N range. The Gd 4f moments order below T-2 with a ferromagnetic component mainly out of plane. Below T-1, the ferromagnetic components are confined to the crystallographic plane. Remarkably, at low temperatures the Fe moments maintain the same modulation as at high temperatures, but the Gd 4f moments apparently do not follow this modulation. The magnetic phase diagrams for fields applied in [110] and [001] direction are presented and possible magnetic structures are discussed.

【 授权许可】

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