Incommensurate magnetism in K2MnS2-xSex and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains

Ankita Bhutani; Piush Behera; Rebecca D. McAuliffe; Huibo Cao; Ashfia Huq; Melanie J. Kirkham; Clarina R. Dela Cruz; Toby Woods; Daniel P. Shoemaker

doi:10.1103/PhysRevMaterials.3.064404

Incommensurate magnetism in K2MnS2-xSex and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains

Ankita Bhutani, Piush Behera, Rebecca D. McAuliffe, Huibo Cao, Ashfia Huq, Melanie J. Kirkham, Clarina R. Dela Cruz, Toby Woods, Daniel P. Shoemaker

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Abstract

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. The varying geometries accessible in compounds of this structure type are presented as promising avenues to tune frustration.

Original language	English
Article number	064404
Journal	Physical Review Materials
Volume	3
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevMaterials.3.064404
State	Published - Jun 5 2019

Funding

We acknowledge support from the Center for Emergent Superconductivity, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DEAC0298CH1088. Characterization was performed in the Materials Research Laboratory Central Research Facilities, University of Illinois. Single-crystal neutron diffraction and powder neutron diffraction were conducted at ORNL's High Flux Isotope Reactor and Spallation Neutron Source, sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. We acknowledge support from the Center for Emergent Superconductivity, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DEAC0298CH1088. Characterization was performed in the Materials Research Laboratory Central Research Facilities, University of Illinois. Single-crystal neutron diffraction and powder neutron diffraction were conducted at ORNL's High Flux Isotope Reactor and Spallation Neutron Source, sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy.

Funders	Funder number
Office of Basic Energy Sciences
Scientific User Facilities Division
U.S. Department of Energy	DEAC0298CH1088
Office of Science

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10.1103/PhysRevMaterials.3.064404

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

abstract = "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. The varying geometries accessible in compounds of this structure type are presented as promising avenues to tune frustration.",

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

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AU - Behera, Piush

AU - McAuliffe, Rebecca D.

AU - Cao, Huibo

AU - Huq, Ashfia

AU - Kirkham, Melanie J.

AU - Dela Cruz, Clarina R.

AU - Woods, Toby

AU - Shoemaker, Daniel P.

PY - 2019/6/5

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N2 - 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. The varying geometries accessible in compounds of this structure type are presented as promising avenues to tune frustration.

AB - 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. The varying geometries accessible in compounds of this structure type are presented as promising avenues to tune frustration.

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Incommensurate magnetism in K2MnS2-xSex and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains

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