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

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Angst, M.
Kreyssig, Andreas
Janssen, Y.
Kim, J. W.
Tan, L.
Wermeille, D.
Mozharivskyij, Y.
Kracher, A.
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American Physical Society
Goldman, Alan
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Canfield, Paul
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Physics and Astronomy
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Ames National Laboratory

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For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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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.
This article is published as Angst, M., A. Kreyssig, Y. Janssen, J-W. Kim, L. Tan, D. Wermeille, Y. Mozharivskyij, A. Kracher, A. I. Goldman, and P. C. Canfield. "Distinct order of Gd 4 f and Fe 3 d moments coexisting in Gd Fe 4 Al 8." Physical Review B 72, no. 17 (2005): 174407. DOI: 10.1103/PhysRevB.72.174407. Copyright 2005 American Physical Society. Posted with permission.