This content will become publicly available on August 9, 2020
Competing magnetic phases and itinerant magnetic frustration in
Abstract
Whereas magnetic frustration is usually associated with local-moment magnets in special geometric arrangements, here we show that 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 below T ≈ 100 K centered at the stripe-type 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 temperature-induced crossover from an instability towards FM ordering to an instability towards stripe-type AF ordering on cooling, and show findings from Monte-Carlo 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 exact-diagonalization 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 Laboratory (AMES), Ames, IA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1560259
- Alternate Identifier(s):
- OSTI ID: 1550593
- Report Number(s):
- IS-J-10008
Journal ID: ISSN 2469-9950; PRBMDO
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 5; 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; 36 MATERIALS SCIENCE
Citation Formats
Li, Bing, Ueland, B. G., Jayasekara, W. T., Abernathy, D. L., Sangeetha, N. S., Johnston, D. C., Ding, Qing-Ping, 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, Qing-Ping, 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:10.1103/PhysRevB.100.054411.
Li, Bing, Ueland, B. G., Jayasekara, W. T., Abernathy, D. L., Sangeetha, N. S., Johnston, D. C., Ding, Qing-Ping, 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:10.1103/PhysRevB.100.054411.
@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, Qing-Ping 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 local-moment 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 stripe-type 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 temperature-induced crossover from an instability towards FM ordering to an instability towards stripe-type AF ordering on cooling, and show findings from Monte-Carlo simulations for a J1-J2 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 exact-diagonalization calculations for the J1-J2 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}
}
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