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Title: Incommensurate magnetism in K 2 MnS 2 x Se x and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains

Abstract

We report a detailed investigation of K 2MnS 2 and K 2MnSe 2 from the K 2MnS 2 structure type and their magnetic solid solution K 2MnS 2–xSe 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 2MnS 2–xSe 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 2MnS 2–xSe 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:
 [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [2];  [2]; ORCiD logo [2];  [1];  [1]
  1. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
  2. 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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