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# Competing magnetic phases and itinerant magnetic frustration in ${\mathrm{SrCo}}_{2}{\mathrm{As}}_{2}$

## Abstract

Whereas magnetic frustration is usually associated with local-moment 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 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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