Helical magnetic order and Fermi surface nesting in non-centrosymmetric ScFeGe
| Autor: | Vincent Meunier, P. W. Adams, Oksana Zaharko, C. R. Dela Cruz, W. A. Phelan, Guixin Cao, A. khasanov, Ilya Vekhter, Huibo Cao, Michael A. McGuire, Sunil K. Karna, Phillip Sprunger, Qiang Zhang, Wei Tian, Weiwei Xie, Damien Tristant, Chetan Dhital, Yonghua Wu, Ramakanta Chapai, Dana A. Browne, Yu Li, R. Jin, Andreas F. V. Roy, William A. Shelton, J. K. Hebert, Adam A. Aczel, David P. Young, John Ditusa |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed Matter - Materials Science Magnetoresistance Condensed matter physics Magnetic moment Magnetic structure Fermi level Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Fermi surface Fermi energy 02 engineering and technology 021001 nanoscience & nanotechnology 7. Clean energy 01 natural sciences Magnetic field symbols.namesake 0103 physical sciences symbols Spin density wave Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology |
| DOI: | 10.48550/arxiv.2009.14387 |
| Popis: | 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 \textbf{\textit{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. Comment: 15 pages, 13 figures |
| Databáze: | OpenAIRE |
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