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26 April 2024 |
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Helical magnetic order and Fermi surface nesting in non-centrosymmetric ScFeGe | | Sunil K. Karna
; D. Tristant
; J. K. Hebert
; G. Cao
; R. Chapai
; W. A. Phelan
; Q. Zhang
; Y. Wu
; C. Dhital
; Y. Li
; H. B. Cao
; W. Tian
; C. R. Dela Cruz
; A. A. Aczel
; O. Zaharko
; A. Khasanov
; M. A. McGuire
; A. Roy
; W. Xie
; D. A. Browne
; I. Vekhter
; V. Meunier
; W. A. Shelton
; P. W. Adams
; P. T. Sprunger
; D. P. Young
; R. Jin
; J. F. DiTusa
; | | Date: |
30 Sep 2020 | | Abstract: | An investigation of the structural, magnetic, thermodynamic, and charge
transport properties of non-centrosymmetric hexagonal ScFeGe reveals it to be
an anisotropic metal with a transition to a weak itinerant incommensurate
helimagnetic state below $T_N = 36$ K. Neutron diffraction measurements
discovered a temperature and field independent helical wavevector
extbf{ extit{k}} = (0 0 0.193) with magnetic moments of 0.53 $mu_{B}$ per
formula unit confined to the {it ab}-plane. Density functional theory
calculations are consistent with these measurements and find several bands that
cross the Fermi level along the {it c}-axis with a nearly degenerate set of
flat bands just above the Fermi energy. The anisotropy found in the electrical
transport is reflected in the calculated Fermi surface, which consists of
several warped flat sheets along the $c$-axis with two regions of significant
nesting, one of which has a wavevector that closely matches that found in the
neutron diffraction. The electronic structure calculations, along with a strong
anomaly in the {it c}-axis conductivity at $T_N$, signal a Fermi surface
driven magnetic transition, similar to that found in spin density wave
materials. Magnetic fields applied in the {it ab}-plane result in a
metamagnetic transition with a threshold field of $approx$ 6.7 T along with a
sharp, strongly temperature dependent, discontinuity and a change in sign of
the magnetoresistance for in-plane currents. Thus, ScFeGe is an ideal system to
investigate the effect of in-plane magnetic fields on an easy-plane magnetic
system, where the relative strength of the magnetic interactions and
anisotropies determine the topology and magnetic structure. | | Source: | arXiv, 2009.14387 | | Services: | Forum | Review | PDF | Favorites | |
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