Competing magnetic phases and itinerant magnetic frustration in ${\mathrm{SrCo}}_{2}{\mathrm{As}}_{2}$
Abstract
Whereas magnetic frustration is usually associated with localmoment magnets in special geometric arrangements, here we show that ${\mathrm{SrCo}}_{2}{\mathrm{As}}_{2}$ is a candidate for frustrated itinerant magnetism. Using inelastic neutron scattering (INS), we determine that antiferromagnetic (AF) spin fluctuations develop in the square Co layers of ${\mathrm{SrCo}}_{2}{\mathrm{As}}_{2}$ below T ≈ 100 K centered at the stripetype AF propagation vector of ($$\frac{1}{2}$$, $$\frac{1}{2}$$), and that their development is concomitant with a suppression of the uniform magnetic susceptibility determined via magnetization measurements. We interpret this switch in spectral weight as signaling a temperatureinduced crossover from an instability towards FM ordering to an instability towards stripetype AF ordering on cooling, and show findings from MonteCarlo simulations for a J_{1}J_{2} Heisenberg model that illustrate how the crossover develops as a function of the frustration ratio –J_{1}/(2J_{2}). By putting our INS data on an absolute scale, we quantitatively compare them and our magnetization data to exactdiagonalization calculations for the J_{1}J_{2} model [N. Shannon et al., Eur. Phys. J. B 38, 599 (2004)], and show that the calculations predict a lower level of magnetic frustration than indicated by experiment. We trace this discrepancy to the large energy scale of the fluctuations (J_{avg} ≳ 75 meV), which, in addition to the steep dispersion, is more characteristic of itinerant magnetism.
 Authors:

 Ames Lab. and Iowa State Univ., Ames, IA (United States)
 Ames Lab., Ames, IA (United States)
 Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
 Publication Date:
 Research Org.:
 Ames Lab., Ames, IA (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1560259
 Alternate Identifier(s):
 OSTI ID: 1550593
 Report Number(s):
 ISJ10008
Journal ID: ISSN 24699950; PRBMDO; TRN: US2000463
 Grant/Contract Number:
 AC0207CH11358
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review B
 Additional Journal Information:
 Journal Volume: 100; Journal Issue: 5; Journal ID: ISSN 24699950
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE
Citation Formats
Li, Bing, Ueland, B. G., Jayasekara, W. T., Abernathy, D. L., Sangeetha, N. S., Johnston, D. C., Ding, QingPing, Furukawa, Y., Orth, P. P., Kreyssig, A., Goldman, A. I., and McQueeney, R. J. Competing magnetic phases and itinerant magnetic frustration in SrCo2As2. United States: N. p., 2019.
Web. doi:10.1103/PhysRevB.100.054411.
Li, Bing, Ueland, B. G., Jayasekara, W. T., Abernathy, D. L., Sangeetha, N. S., Johnston, D. C., Ding, QingPing, Furukawa, Y., Orth, P. P., Kreyssig, A., Goldman, A. I., & McQueeney, R. J. Competing magnetic phases and itinerant magnetic frustration in SrCo2As2. United States. doi:https://doi.org/10.1103/PhysRevB.100.054411
Li, Bing, Ueland, B. G., Jayasekara, W. T., Abernathy, D. L., Sangeetha, N. S., Johnston, D. C., Ding, QingPing, Furukawa, Y., Orth, P. P., Kreyssig, A., Goldman, A. I., and McQueeney, R. J. Fri .
"Competing magnetic phases and itinerant magnetic frustration in SrCo2As2". United States. doi:https://doi.org/10.1103/PhysRevB.100.054411. https://www.osti.gov/servlets/purl/1560259.
@article{osti_1560259,
title = {Competing magnetic phases and itinerant magnetic frustration in SrCo2As2},
author = {Li, Bing and Ueland, B. G. and Jayasekara, W. T. and Abernathy, D. L. and Sangeetha, N. S. and Johnston, D. C. and Ding, QingPing and Furukawa, Y. and Orth, P. P. and Kreyssig, A. and Goldman, A. I. and McQueeney, R. J.},
abstractNote = {Whereas magnetic frustration is usually associated with localmoment magnets in special geometric arrangements, here we show that SrCo2As2 is a candidate for frustrated itinerant magnetism. Using inelastic neutron scattering (INS), we determine that antiferromagnetic (AF) spin fluctuations develop in the square Co layers of SrCo2As2 below T ≈ 100 K centered at the stripetype AF propagation vector of ($\frac{1}{2}$, $\frac{1}{2}$), and that their development is concomitant with a suppression of the uniform magnetic susceptibility determined via magnetization measurements. We interpret this switch in spectral weight as signaling a temperatureinduced crossover from an instability towards FM ordering to an instability towards stripetype AF ordering on cooling, and show findings from MonteCarlo simulations for a J1J2 Heisenberg model that illustrate how the crossover develops as a function of the frustration ratio –J1/(2J2). By putting our INS data on an absolute scale, we quantitatively compare them and our magnetization data to exactdiagonalization calculations for the J1J2 model [N. Shannon et al., Eur. Phys. J. B 38, 599 (2004)], and show that the calculations predict a lower level of magnetic frustration than indicated by experiment. We trace this discrepancy to the large energy scale of the fluctuations (Javg ≳ 75 meV), which, in addition to the steep dispersion, is more characteristic of itinerant magnetism.},
doi = {10.1103/PhysRevB.100.054411},
journal = {Physical Review B},
number = 5,
volume = 100,
place = {United States},
year = {2019},
month = {8}
}
Web of Science
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