Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe3-xGeTe2

May, Andrew F.; Calder, Stuart A.; Cantoni, Claudia; Cao, Huibo; McGuire, Michael A.

doi:10.1103/PhysRevB.93.014411

Title: Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe_3-xGeTe₂

Journal Article · Fri Jan 08 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.014411· OSTI ID:1235824

May, Andrew F. ^[1]; Calder, Stuart A. ^[1]; Cantoni, Claudia ^[1]; Cao, Huibo ^[1]; McGuire, Michael A. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The magnetic structure and phase diagram of the layered ferromagnetic compound Fe₃GeTe₂ have been investigated by a combination of synthesis, x-ray and neutron diffraction, high-resolution microscopy, and magnetization measurements. Single crystals were synthesized by self-flux reactions, and single-crystal neutron diffraction finds ferromagnetic order with moments of 1.11(5)μ_B/Fe aligned along the c axis at 4 K. These flux-grown crystals have a lower Curie temperature T_c ≈ 150 K than crystals previously grown by vapor transport (T_c = 220 K). The difference is a reduced Fe content in the flux-grown crystals, as illustrated by the behavior observed in a series of polycrystalline samples. As Fe content decreases, so do the Curie temperature, magnetic anisotropy, and net magnetization. Furthermore, Hall-effect and thermoelectric measurements on flux-grown crystals suggest that multiple carrier types contribute to electrical transport in Fe_3–xGeTe₂ and structurally similar Ni_3–xGeTe₂.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1235824

Alternate ID(s):: OSTI ID: 1234281

Journal Information:: Physical Review B, Vol. 93, Issue 1; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 158 works

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