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Title: Helical magnetic order and Fermi surface nesting in noncentrosymmetric ScFeGe

Abstract

Here, an investigation of the structural, magnetic, thermodynamic, and charge transport properties of noncentrosymmetric hexagonal ScFeGe reveals it to be an anisotropic metal with a transition to a weak itinerant incommensurate helimagnetic state below TN=36 K. Neutron diffraction measurements discovered a temperature and field independent helical wave vector k = (0 0 0.193) with magnetic moments of 0.53 μB per Fe confined to the ab-plane. Density functional theory calculations are consistent with these measurements and find several bands that cross the Fermi level along the 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 wave vector that closely matches that found in the neutron diffraction. The electronic structure calculations, along with a strong anomaly in the c-axis conductivity at TN, signal a Fermi surface driven magnetic transition, similar to that found in spin density wave materials. Magnetic fields applied in the ab-plane result in a metamagnetic transition with a threshold field of ≈ 6.7 T along with a sharp, stronglymore » 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 a helimagnet with a c-axis propagation vector, where the relative strength of the magnetic interactions and anisotropies determine the topology and magnetic structure.« less

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [2];  [3]; ORCiD logo [5]; ORCiD logo [5];  [6];  [2]; ORCiD logo [7]; ORCiD logo [7]; ORCiD logo [7]; ORCiD logo [7];  [8];  [9]; ORCiD logo [7];  [2];  [10];  [2] more »;  [2];  [11];  [2];  [2];  [2];  [2];  [2];  [12] « less
+ Show Author Affiliations
  1. Louisiana State Univ., Baton Rouge, LA (United States); Norfolk State Univ., Norfolk, VA (United States)
  2. Louisiana State Univ., Baton Rouge, LA (United States)
  3. Louisiana State Univ., Baton Rouge, LA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Louisiana State Univ., Baton Rouge, LA (United States); Shanghai Univ. (China)
  5. Louisiana State Univ., Baton Rouge, LA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Louisiana State Univ., Baton Rouge, LA (United States); Kennesaw State Univ., Marietta, GA (United States)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  8. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  9. Univ. of North Carolina, Asheville, NC (United States)
  10. Louisiana State Univ., Baton Rouge, LA (United States); Rutgers Univ., Piscataway, NJ (United States)
  11. Rensselaer Polytechnic Inst., Troy, NY (United States)
  12. Louisiana State Univ., Baton Rouge, LA (United States); Department of Physics, Indiana Univ.-Purdue Univ. Indianapolis (IUPUI), Indianapolis, IN (United States)
Publication Date:
Research Org.:
Louisiana State Univ., Baton Rouge, LA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1771789
Alternate Identifier(s):
OSTI ID: 1783029
Grant/Contract Number:  
SC0012432; DMR-1410741; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 103; Journal Issue: 1; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Noncentrosymmetric materials; Noncollinear magnets; Density functional calculations; Magnetization measurements; Neutron diffraction; Resistivity measurements

Citation Formats

Karna, Sunil K., Tristant, D., Hebert, J. K., Cao, G., Chapai, R., Phelan, W. A., Zhang, Qiang, Wu, Yan, Dhital, C., Li, Y., Cao, Huibo B., Tian, Wei, Dela Cruz, Clarina R., Aczel, Adam A., Zaharko, O., Khasanov, A., McGuire, Michael A., Roy, A., Xie, W., Browne, D. A., Vekhter, I., Meunier, V., Shelton, W. A., Adams, P. W., Sprunger, P. T., Young, D. P., Jin, R., and DiTusa, J. F. Helical magnetic order and Fermi surface nesting in noncentrosymmetric ScFeGe. United States: N. p., 2021. Web. doi:10.1103/physrevb.103.014443.
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Karna, Sunil K., Tristant, D., Hebert, J. K., Cao, G., Chapai, R., Phelan, W. A., Zhang, Qiang, Wu, Yan, Dhital, C., Li, Y., Cao, Huibo B., Tian, Wei, Dela Cruz, Clarina R., Aczel, Adam A., Zaharko, O., Khasanov, A., McGuire, Michael A., Roy, A., Xie, W., Browne, D. A., Vekhter, I., Meunier, V., Shelton, W. A., Adams, P. W., Sprunger, P. T., Young, D. P., Jin, R., & DiTusa, J. F. Helical magnetic order and Fermi surface nesting in noncentrosymmetric ScFeGe. United States. https://doi.org/10.1103/physrevb.103.014443
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Karna, Sunil K., Tristant, D., Hebert, J. K., Cao, G., Chapai, R., Phelan, W. A., Zhang, Qiang, Wu, Yan, Dhital, C., Li, Y., Cao, Huibo B., Tian, Wei, Dela Cruz, Clarina R., Aczel, Adam A., Zaharko, O., Khasanov, A., McGuire, Michael A., Roy, A., Xie, W., Browne, D. A., Vekhter, I., Meunier, V., Shelton, W. A., Adams, P. W., Sprunger, P. T., Young, D. P., Jin, R., and DiTusa, J. F. Wed . "Helical magnetic order and Fermi surface nesting in noncentrosymmetric ScFeGe". United States. https://doi.org/10.1103/physrevb.103.014443. https://www.osti.gov/servlets/purl/1771789.
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@article{osti_1771789,
title = {Helical magnetic order and Fermi surface nesting in noncentrosymmetric ScFeGe},
author = {Karna, Sunil K. and Tristant, D. and Hebert, J. K. and Cao, G. and Chapai, R. and Phelan, W. A. and Zhang, Qiang and Wu, Yan and Dhital, C. and Li, Y. and Cao, Huibo B. and Tian, Wei and Dela Cruz, Clarina R. and Aczel, Adam A. and Zaharko, O. and Khasanov, A. and McGuire, Michael A. and Roy, A. and Xie, W. and Browne, D. A. and Vekhter, I. and Meunier, V. and Shelton, W. A. and Adams, P. W. and Sprunger, P. T. and Young, D. P. and Jin, R. and DiTusa, J. F.},
abstractNote = {Here, an investigation of the structural, magnetic, thermodynamic, and charge transport properties of noncentrosymmetric hexagonal ScFeGe reveals it to be an anisotropic metal with a transition to a weak itinerant incommensurate helimagnetic state below TN=36 K. Neutron diffraction measurements discovered a temperature and field independent helical wave vector k = (0 0 0.193) with magnetic moments of 0.53 μB per Fe confined to the ab-plane. Density functional theory calculations are consistent with these measurements and find several bands that cross the Fermi level along the 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 wave vector that closely matches that found in the neutron diffraction. The electronic structure calculations, along with a strong anomaly in the c-axis conductivity at TN, signal a Fermi surface driven magnetic transition, similar to that found in spin density wave materials. Magnetic fields applied in the ab-plane result in a metamagnetic transition with a threshold field of ≈ 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 a helimagnet with a c-axis propagation vector, where the relative strength of the magnetic interactions and anisotropies determine the topology and magnetic structure.},
doi = {10.1103/physrevb.103.014443},
journal = {Physical Review B},
number = 1,
volume = 103,
place = {United States},
year = {Wed Jan 27 00:00:00 EST 2021},
month = {Wed Jan 27 00:00:00 EST 2021}
}
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