Competing spin density wave, collinear, and helical magnetism in Fe1+xTe

Stock, C.; Rodriguez, E. E.; Bourges, P.; Ewings, R. A.; Cao, H.; Chi, S.; Rodriguez-Rivera, J. A.; Green, M. A.

doi:10.1103/PhysRevB.95.144407

Title: Competing spin density wave, collinear, and helical magnetism in ${Fe}_{1 + x} Te$

Journal Article · Fri Apr 07 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.144407· OSTI ID:1427594

Stock, C. ^[1]; Rodriguez, E. E. ^[2]; Bourges, P. ^[3]; Ewings, R. A. ^[4]; Cao, H. ^[5]; Chi, S. ^[5]; Rodriguez-Rivera, J. A. ^[6]; Green, M. A. ^[7]

Univ. of Edinburgh, Scotland (United Kingdom). School of Physics and Astronomy
Univ. of Maryland, College Park, MD (United States). Dept. of Chemistry of Biochemistry
Alternative Energies and Atomic Energy Commission (CEA-CNRS), Gif-sur-Yvette (France). Lab. Leon Brillouin
Rutherford Appleton Lab., Didcot (United Kingdom). ISIS Facility
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). NIST Center for Neutron Research; Univ. of Maryland, College Park, MD (United States). Dept. of Materials Science
Univ. of Kent, Canterbury (United Kingdom). School of Physical Sciences

The Fe_1+xTe phase diagram consists of two distinct magnetic structures with collinear order present at low interstitial iron concentrations and a helical phase at large values of x with these phases separated by a Lifshitz point. In this paper, we use unpolarized single-crystal diffraction to confirm the helical phase for large interstitial iron concentrations and polarized single-crystal diffraction to demonstrate the collinear order for the iron-deficient side of the Fe_1+xTe phase diagram. Polarized neutron inelastic scattering shows that the fluctuations associated with this collinear order are predominately transverse at low-energy transfers, consistent with a localized magnetic moment picture. We then apply neutron inelastic scattering and polarization analysis to investigate the dynamics and structure near the boundary between collinear and helical orders in the Fe_1+xTe phase diagram. We first show that the phase separating collinear and helical orders is characterized by a spin density wave with a single propagation wave vector of (~0.45, 0, 0.5). We do not observe harmonics or the presence of a charge density wave. The magnetic fluctuations associated with this wave vector are different from the collinear phase, being strongly longitudinal in nature and correlated anisotropically in the (H,K) plane. The excitations preserve the C₄ symmetry of the lattice but display different widths in momentum along the two tetragonal directions at low-energy transfers. Finally, while the low-energy excitations and minimal magnetic phase diagram can be understood in terms of localized interactions, we suggest that the presence of the density wave phase implies the importance of electronic and orbital properties.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Edinburgh, Scotland (United Kingdom); Rutherford Appleton Lab., Didcot (United Kingdom)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Royal Society of Edinburgh; Engineering and Physical Sciences Research Council (EPSRC)

Grant/Contract Number:: AC05-00OR22725; DMR-09447720

OSTI ID:: 1427594

Alternate ID(s):: OSTI ID: 1350790

Journal Information:: Physical Review B, Vol. 95, Issue 14; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Title: Competing spin density wave, collinear, and helical magnetism in Fe 1 + x Te

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Title: Competing spin density wave, collinear, and helical magnetism in ${Fe}_{1 + x} Te$