Synthesis and physical and magnetic properties of CuAlCr4 S8: A Cr-based breathing pyrochlore

S. Sharma; M. Pocrnic; B. N. Richtik; C. R. Wiebe; J. Beare; J. Gautreau; J. P. Clancy; J. P.C. Ruff; M. Pula; Q. Chen; S. Yoon; Y. Cai; G. M. Luke

doi:10.1103/PhysRevB.106.024407

Synthesis and physical and magnetic properties of CuAlCr4 S8: A Cr-based breathing pyrochlore

S. Sharma, M. Pocrnic, B. N. Richtik, C. R. Wiebe, J. Beare, J. Gautreau, J. P. Clancy, J. P.C. Ruff, M. Pula, Q. Chen, S. Yoon, Y. Cai, G. M. Luke

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6 Scopus citations

Abstract

We present the synthesis and physical properties of a breathing pyrochlore magnet CuAlCr4S8 via synchrotron x-ray diffraction, magnetization under ambient and applied hydrostatic pressure, heat capacity, and muon spin relaxation/rotation measurements. CuAlCr4S8 exhibits positive thermal expansion with a concave upward temperature dependence. We observed a sharp antiferromagnetic ordering transition of a purely magnetic nature at 20 K, which shifts by as much as 3.2 K on application of 600 MPa pressure. The breathing factor (Bf=J'/J) in breathing pyrochlores can be an important parameter to tune the magnetic ground states of the pyrochlore lattice. The breathing factor can be modulated through the breathing ratio, the ratio of the sizes of the two tetrahedra, by using different elements at the A and A' sites in the breathing pyrochlore structure. We find that CuAlCr4S8 has a breathing ratio of 1.0663(8), which is comparable to other sulfur breathing pyrochlores.

Original language	English
Article number	024407
Journal	Physical Review B
Volume	106
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.106.024407
State	Published - Jul 1 2022
Externally published	Yes

Funding

We would like to thank S. Dunsiger for her assistance during the measurements. Work at McMaster was supported by the Natural Sciences and Engineering Research Council of Canada. Portions of this work are based upon research conducted at the Center for High Energy X-ray Sciences (CHEXS), which is supported by the National Science Foundation under Award No. DMR-1829070. This research was undertaken owing, in part, to funding from the Max Planck-UBC-UTokyo Center for Quantum Materials and the Canada First Research Excellence Fund, Quantum Materials and Future Technologies Program. Work at University of Winnipeg was supported by Natural Sciences and Engineering Research Council of Canada (NSERC) and Canada Foundation for Innovation (CFI).

Funders	Funder number
Max Planck-UBC-UTokyo Center for Quantum Materials and the Canada First Research Excellence Fund
Quantum Materials and Future Technologies Program
National Science Foundation	DMR-1829070
Natural Sciences and Engineering Research Council of Canada
Canada Foundation for Innovation

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10.1103/PhysRevB.106.024407

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title = "Synthesis and physical and magnetic properties of CuAlCr4 S8: A Cr-based breathing pyrochlore",

abstract = "We present the synthesis and physical properties of a breathing pyrochlore magnet CuAlCr4S8 via synchrotron x-ray diffraction, magnetization under ambient and applied hydrostatic pressure, heat capacity, and muon spin relaxation/rotation measurements. CuAlCr4S8 exhibits positive thermal expansion with a concave upward temperature dependence. We observed a sharp antiferromagnetic ordering transition of a purely magnetic nature at 20 K, which shifts by as much as 3.2 K on application of 600 MPa pressure. The breathing factor (Bf=J'/J) in breathing pyrochlores can be an important parameter to tune the magnetic ground states of the pyrochlore lattice. The breathing factor can be modulated through the breathing ratio, the ratio of the sizes of the two tetrahedra, by using different elements at the A and A' sites in the breathing pyrochlore structure. We find that CuAlCr4S8 has a breathing ratio of 1.0663(8), which is comparable to other sulfur breathing pyrochlores.",

author = "S. Sharma and M. Pocrnic and Richtik, {B. N.} and Wiebe, {C. R.} and J. Beare and J. Gautreau and Clancy, {J. P.} and Ruff, {J. P.C.} and M. Pula and Q. Chen and S. Yoon and Y. Cai and Luke, {G. M.}",

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doi = "10.1103/PhysRevB.106.024407",

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T2 - A Cr-based breathing pyrochlore

AU - Sharma, S.

AU - Pocrnic, M.

AU - Richtik, B. N.

AU - Wiebe, C. R.

AU - Beare, J.

AU - Gautreau, J.

AU - Clancy, J. P.

AU - Ruff, J. P.C.

AU - Pula, M.

AU - Chen, Q.

AU - Yoon, S.

AU - Cai, Y.

AU - Luke, G. M.

PY - 2022/7/1

Y1 - 2022/7/1

N2 - We present the synthesis and physical properties of a breathing pyrochlore magnet CuAlCr4S8 via synchrotron x-ray diffraction, magnetization under ambient and applied hydrostatic pressure, heat capacity, and muon spin relaxation/rotation measurements. CuAlCr4S8 exhibits positive thermal expansion with a concave upward temperature dependence. We observed a sharp antiferromagnetic ordering transition of a purely magnetic nature at 20 K, which shifts by as much as 3.2 K on application of 600 MPa pressure. The breathing factor (Bf=J'/J) in breathing pyrochlores can be an important parameter to tune the magnetic ground states of the pyrochlore lattice. The breathing factor can be modulated through the breathing ratio, the ratio of the sizes of the two tetrahedra, by using different elements at the A and A' sites in the breathing pyrochlore structure. We find that CuAlCr4S8 has a breathing ratio of 1.0663(8), which is comparable to other sulfur breathing pyrochlores.

AB - We present the synthesis and physical properties of a breathing pyrochlore magnet CuAlCr4S8 via synchrotron x-ray diffraction, magnetization under ambient and applied hydrostatic pressure, heat capacity, and muon spin relaxation/rotation measurements. CuAlCr4S8 exhibits positive thermal expansion with a concave upward temperature dependence. We observed a sharp antiferromagnetic ordering transition of a purely magnetic nature at 20 K, which shifts by as much as 3.2 K on application of 600 MPa pressure. The breathing factor (Bf=J'/J) in breathing pyrochlores can be an important parameter to tune the magnetic ground states of the pyrochlore lattice. The breathing factor can be modulated through the breathing ratio, the ratio of the sizes of the two tetrahedra, by using different elements at the A and A' sites in the breathing pyrochlore structure. We find that CuAlCr4S8 has a breathing ratio of 1.0663(8), which is comparable to other sulfur breathing pyrochlores.

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Synthesis and physical and magnetic properties of CuAlCr4 S8: A Cr-based breathing pyrochlore

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