Suppressed incommensurate order in swedenborgite Ca0.5 Y0.5BaCo4 O7

Shang Gao; Vilmos Kocsis; Minoru Soda; Feng Ye; Yaohua Liu; Andrew F. May; Yasujiro Taguchi; Yoshinori Tokura; Taka Hisa Arima; Werner Schweika; Andrew D. Christianson; Matthew B. Stone

doi:10.1103/PhysRevB.104.L140408

Suppressed incommensurate order in swedenborgite Ca_0.5 Y_0.5BaCo₄ O₇

Shang Gao, Vilmos Kocsis, Minoru Soda, Feng Ye, Yaohua Liu, Andrew F. May, Yasujiro Taguchi, Yoshinori Tokura, Taka Hisa Arima, Werner Schweika, Andrew D. Christianson, Matthew B. Stone

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4 Scopus citations

Abstract

Swedenborgite Ca0.5Y0.5BaCo4O7 (CYBCO) with geometrically frustrated kagome and triangular lattices exhibits a disordered ground state in spite of strong antiferromagnetic couplings between the Co spins. The character of the disordered state has been debated due to ambiguous Co states in the triangular layers. Here, we perform single-crystal diffuse neutron scattering experiments to fully characterize the short-range spin correlations in CYBCO. Through reverse Monte Carlo and self-consistent Gaussian approximation analyses, we confirm that the Co ions in both the kagome and triangular layers are magnetic, and the interlayer couplings, together with the lattice distortion, promote an incommensurate magnetic order that is suppressed possibly by exchange disorder. Our work clarifies the short-range spin correlations in CYBCO and establishes a general correspondence between unequal interactions and incommensurate spin correlations on the swedenborgite lattice.

Original language	English
Article number	A81
Journal	Physical Review B
Volume	104
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.104.L140408
State	Published - Oct 1 2021

Funding

We acknowledge discussions with R. Hermann, J. Paddison, and assistance from J. Xing and J.-Q. Yan. This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. This research used resources at the Spallation Neutron Source (SNS), a DOE Office of Science User Facilities operated by the Oak Ridge National Laboratory (ORNL). ORNL is managed by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 for the U.S. Department of Energy. The U.S. Government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. Government purposes.

Funders	Funder number
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Oak Ridge National Laboratory	DE-AC05-00OR22725
Division of Materials Sciences and Engineering

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title = "Suppressed incommensurate order in swedenborgite Ca0.5 Y0.5BaCo4 O7",

abstract = "Swedenborgite Ca0.5Y0.5BaCo4O7 (CYBCO) with geometrically frustrated kagome and triangular lattices exhibits a disordered ground state in spite of strong antiferromagnetic couplings between the Co spins. The character of the disordered state has been debated due to ambiguous Co states in the triangular layers. Here, we perform single-crystal diffuse neutron scattering experiments to fully characterize the short-range spin correlations in CYBCO. Through reverse Monte Carlo and self-consistent Gaussian approximation analyses, we confirm that the Co ions in both the kagome and triangular layers are magnetic, and the interlayer couplings, together with the lattice distortion, promote an incommensurate magnetic order that is suppressed possibly by exchange disorder. Our work clarifies the short-range spin correlations in CYBCO and establishes a general correspondence between unequal interactions and incommensurate spin correlations on the swedenborgite lattice.",

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AU - Gao, Shang

AU - Kocsis, Vilmos

AU - Soda, Minoru

AU - Ye, Feng

AU - Liu, Yaohua

AU - May, Andrew F.

AU - Taguchi, Yasujiro

AU - Tokura, Yoshinori

AU - Arima, Taka Hisa

AU - Schweika, Werner

AU - Christianson, Andrew D.

AU - Stone, Matthew B.

PY - 2021/10/1

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N2 - Swedenborgite Ca0.5Y0.5BaCo4O7 (CYBCO) with geometrically frustrated kagome and triangular lattices exhibits a disordered ground state in spite of strong antiferromagnetic couplings between the Co spins. The character of the disordered state has been debated due to ambiguous Co states in the triangular layers. Here, we perform single-crystal diffuse neutron scattering experiments to fully characterize the short-range spin correlations in CYBCO. Through reverse Monte Carlo and self-consistent Gaussian approximation analyses, we confirm that the Co ions in both the kagome and triangular layers are magnetic, and the interlayer couplings, together with the lattice distortion, promote an incommensurate magnetic order that is suppressed possibly by exchange disorder. Our work clarifies the short-range spin correlations in CYBCO and establishes a general correspondence between unequal interactions and incommensurate spin correlations on the swedenborgite lattice.

AB - Swedenborgite Ca0.5Y0.5BaCo4O7 (CYBCO) with geometrically frustrated kagome and triangular lattices exhibits a disordered ground state in spite of strong antiferromagnetic couplings between the Co spins. The character of the disordered state has been debated due to ambiguous Co states in the triangular layers. Here, we perform single-crystal diffuse neutron scattering experiments to fully characterize the short-range spin correlations in CYBCO. Through reverse Monte Carlo and self-consistent Gaussian approximation analyses, we confirm that the Co ions in both the kagome and triangular layers are magnetic, and the interlayer couplings, together with the lattice distortion, promote an incommensurate magnetic order that is suppressed possibly by exchange disorder. Our work clarifies the short-range spin correlations in CYBCO and establishes a general correspondence between unequal interactions and incommensurate spin correlations on the swedenborgite lattice.

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Suppressed incommensurate order in swedenborgite Ca_0.5 Y_0.5BaCo₄ O₇

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