## This content will become publicly available on June 5, 2020

# Incommensurate magnetism in ${\mathrm{K}}_{2}{\mathrm{MnS}}_{2\u2013x}{\mathrm{Se}}_{x}$ and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains

## Abstract

We report a detailed investigation of K _{2}MnS _{2} and K _{2}MnSe _{2} from the K _{2}MnS _{2} structure type and their magnetic solid solution K _{2}MnS _{2–x}Se _{x} and find that compounds of this structure type consist of strongly coupled pseudo-one-dimensional antiferromagnetic chains that collectively represent a frustrated two-dimensional triangular antiferromagnet. Bulk samples of K _{2}MnS _{2–x}Se _{x} with 0 ≤ x ≤ 2 are characterized using x-ray diffraction, neutron diffraction, magnetization, and heat-capacity measurements. An incommensurate cycloid magnetic structure with a magnetic propagation vector k = [0.5801] is observed for all samples in K _{2}MnS _{2–x}Se _{x}, and the ordering is robust despite a 12% increase in cell volume. Geometric frustration of chains results in incommensurability along a and a two-step magnetic transition. Here, the varying geometries accessible in compounds of this structure type are presented as promising avenues to tune frustration.

- Authors:

- Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

- Publication Date:

- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

- OSTI Identifier:
- 1559626

- Alternate Identifier(s):
- OSTI ID: 1546396

- Grant/Contract Number:
- AC05-00OR22725; AC02-98CH1088

- Resource Type:
- Accepted Manuscript

- Journal Name:
- Physical Review Materials

- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 6; Journal ID: ISSN 2475-9953

- Publisher:
- American Physical Society (APS)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 36 MATERIALS SCIENCE

### Citation Formats

```
Bhutani, Ankita, Behera, Piush, McAuliffe, Rebecca D., Cao, Huibo, Huq, Ashfia, Kirkham, Melanie J., dela Cruz, Clarina R., Woods, Toby, and Shoemaker, Daniel P. Incommensurate magnetism in K2MnS2–xSex and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains. United States: N. p., 2019.
Web. doi:10.1103/PhysRevMaterials.3.064404.
```

```
Bhutani, Ankita, Behera, Piush, McAuliffe, Rebecca D., Cao, Huibo, Huq, Ashfia, Kirkham, Melanie J., dela Cruz, Clarina R., Woods, Toby, & Shoemaker, Daniel P. Incommensurate magnetism in K2MnS2–xSex and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains. United States. doi:10.1103/PhysRevMaterials.3.064404.
```

```
Bhutani, Ankita, Behera, Piush, McAuliffe, Rebecca D., Cao, Huibo, Huq, Ashfia, Kirkham, Melanie J., dela Cruz, Clarina R., Woods, Toby, and Shoemaker, Daniel P. Wed .
"Incommensurate magnetism in K2MnS2–xSex and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains". United States. doi:10.1103/PhysRevMaterials.3.064404.
```

```
@article{osti_1559626,
```

title = {Incommensurate magnetism in K2MnS2–xSex and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains},

author = {Bhutani, Ankita and Behera, Piush and McAuliffe, Rebecca D. and Cao, Huibo and Huq, Ashfia and Kirkham, Melanie J. and dela Cruz, Clarina R. and Woods, Toby and Shoemaker, Daniel P.},

abstractNote = {We report a detailed investigation of K2MnS2 and K2MnSe2 from the K2MnS2 structure type and their magnetic solid solution K2MnS2–xSex and find that compounds of this structure type consist of strongly coupled pseudo-one-dimensional antiferromagnetic chains that collectively represent a frustrated two-dimensional triangular antiferromagnet. Bulk samples of K2MnS2–xSex with 0 ≤ x ≤ 2 are characterized using x-ray diffraction, neutron diffraction, magnetization, and heat-capacity measurements. An incommensurate cycloid magnetic structure with a magnetic propagation vector k = [0.5801] is observed for all samples in K2MnS2–xSex, and the ordering is robust despite a 12% increase in cell volume. Geometric frustration of chains results in incommensurability along a and a two-step magnetic transition. Here, the varying geometries accessible in compounds of this structure type are presented as promising avenues to tune frustration.},

doi = {10.1103/PhysRevMaterials.3.064404},

journal = {Physical Review Materials},

number = 6,

volume = 3,

place = {United States},

year = {2019},

month = {6}

}

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