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Title: Competing magnetic phases and itinerant magnetic frustration in SrCo 2 As 2

Abstract

Whereas magnetic frustration is usually associated with local-moment magnets in special geometric arrangements, here we show that SrCo 2 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 SrCo 2 As 2 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.

Authors:
 [1];  [2];  [1];  [3];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States)
  3. 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):
IS-J-10008
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US2000463
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. 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, 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. 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, 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}
}

Journal Article:

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Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Schematic magnetic phase diagram showing the evolution from stripe-type antiferromagnetic (AF) spin fluctuations to two-dimensional ferromagnetic (2D-FM) order in (CaSr)Co2As2. (b) The body-centered-tetragonal unit cell of SrCo2As2 with each square-Co sublattice indicated. (c) Diagram showing stripe-type AF order and the nearest-neighbor (J1) and next-nearest-neighbor (J2) magnetic interactionsmore » in the HK reciprocal-lattice plane. Red and blue symbols denote the two AF sublattices, and the transverse (TR) and longitudinal (LO) directions referred to in the text are labeled. J1 is FM and J2 is AF, and the orange dashed line illustrates a frustrated J1 exchange path. VESTA 17 was used to generate (b).« less

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Works referencing / citing this record:

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