Quantum spin state transitions in the spin-1 equilateral triangular lattice antiferromagnet Na2BaNi(PO4)2

N. Li; Q. Huang; A. Brassington; X. Y. Yue; W. J. Chu; S. K. Guang; X. H. Zhou; P. Gao; E. X. Feng; H. B. Cao; E. S. Choi; Y. Sun; Q. J. Li; X. Zhao; H. D. Zhou; X. F. Sun

doi:10.1103/PhysRevB.104.104403

Quantum spin state transitions in the spin-1 equilateral triangular lattice antiferromagnet Na2BaNi(PO4)2

N. Li, Q. Huang, A. Brassington, X. Y. Yue, W. J. Chu, S. K. Guang, X. H. Zhou, P. Gao, E. X. Feng, H. B. Cao, E. S. Choi, Y. Sun, Q. J. Li, X. Zhao, H. D. Zhou, X. F. Sun

Single Crystal Diffraction

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Abstract

We have grown single crystals of Na2BaNi(PO4)2, a spin-1 equilateral triangular lattice antiferromagnet (ETLAF), and performed magnetic susceptibility, specific heat, and thermal conductivity measurements at ultralow temperatures. The main results are as follows: (i) At zero magnetic field, Na2BaNi(PO4)2 exhibits a magnetic ordering at 430 mK with a weak ferromagnetic moment along the c axis. This suggests a canted 120° spin structure, which is in a plane including the crystallographic c axis due to the existence of an easy-axis anisotropy and ferromagnetically stacked along the c axis. (ii) With increasing field along the c axis, a 1/3 magnetization plateau is observed, which means that the canted 120° spin structure is transformed into an up-up-down (UUD) spin structure. With even higher fields, the UUD phase further evolves into possible V and V′ phases. (iii) With increasing field along the a axis, the canted 120° spin structure is possibly transformed into an umbrella phase and a V phase. Therefore Na2BaNi(PO4)2 is a rare example of a spin-1 ETLAF with single-crystalline form that exhibits easy-axis spin anisotropy and a series of quantum spin state transitions.

Original language	English
Article number	104403
Journal	Physical Review B
Volume	104
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.104.104403
State	Published - Sep 1 2021

Funding

This work was supported by the National Natural Science Foundation of China (Grants No. U1832209, No. 11874336, No. 12174361, No. 12104010, and No. 11904003), the Natural Science Foundation of Anhui Province (Grant No. 1908085MA09), and the Innovative Program of Hefei Science Center CAS (Grant No. 2019HSC-CIP001). The work at the University of Tennessee (Q.H., A.B., and H.D.Z.) was supported by the NSF with Grant No. NSF-DMR-2003117. The work performed at NHMFL was supported by Grant No. NSF-DMR-1157490 and the State of Florida. E.X.F. and H.B.C. acknowledge the support of U.S. DOE BES Early Career Award No. KC0402020 under Contract No. DE-AC05-00OR22725.

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Li, N., Huang, Q., Brassington, A., Yue, X. Y., Chu, W. J., Guang, S. K., Zhou, X. H., Gao, P., Feng, E. X., Cao, H. B., Choi, E. S., Sun, Y., Li, Q. J., Zhao, X., Zhou, H. D., & Sun, X. F. (2021). Quantum spin state transitions in the spin-1 equilateral triangular lattice antiferromagnet Na2BaNi(PO4)2. Physical Review B, 104(10), Article 104403. https://doi.org/10.1103/PhysRevB.104.104403

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title = "Quantum spin state transitions in the spin-1 equilateral triangular lattice antiferromagnet Na2BaNi(PO4)2",

abstract = "We have grown single crystals of Na2BaNi(PO4)2, a spin-1 equilateral triangular lattice antiferromagnet (ETLAF), and performed magnetic susceptibility, specific heat, and thermal conductivity measurements at ultralow temperatures. The main results are as follows: (i) At zero magnetic field, Na2BaNi(PO4)2 exhibits a magnetic ordering at 430 mK with a weak ferromagnetic moment along the c axis. This suggests a canted 120° spin structure, which is in a plane including the crystallographic c axis due to the existence of an easy-axis anisotropy and ferromagnetically stacked along the c axis. (ii) With increasing field along the c axis, a 1/3 magnetization plateau is observed, which means that the canted 120° spin structure is transformed into an up-up-down (UUD) spin structure. With even higher fields, the UUD phase further evolves into possible V and V′ phases. (iii) With increasing field along the a axis, the canted 120° spin structure is possibly transformed into an umbrella phase and a V phase. Therefore Na2BaNi(PO4)2 is a rare example of a spin-1 ETLAF with single-crystalline form that exhibits easy-axis spin anisotropy and a series of quantum spin state transitions.",

author = "N. Li and Q. Huang and A. Brassington and Yue, {X. Y.} and Chu, {W. J.} and Guang, {S. K.} and Zhou, {X. H.} and P. Gao and Feng, {E. X.} and Cao, {H. B.} and Choi, {E. S.} and Y. Sun and Li, {Q. J.} and X. Zhao and Zhou, {H. D.} and Sun, {X. F.}",

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AU - Huang, Q.

AU - Brassington, A.

AU - Yue, X. Y.

AU - Chu, W. J.

AU - Guang, S. K.

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AU - Gao, P.

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AU - Cao, H. B.

AU - Choi, E. S.

AU - Sun, Y.

AU - Li, Q. J.

AU - Zhao, X.

AU - Zhou, H. D.

AU - Sun, X. F.

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Y1 - 2021/9/1

N2 - We have grown single crystals of Na2BaNi(PO4)2, a spin-1 equilateral triangular lattice antiferromagnet (ETLAF), and performed magnetic susceptibility, specific heat, and thermal conductivity measurements at ultralow temperatures. The main results are as follows: (i) At zero magnetic field, Na2BaNi(PO4)2 exhibits a magnetic ordering at 430 mK with a weak ferromagnetic moment along the c axis. This suggests a canted 120° spin structure, which is in a plane including the crystallographic c axis due to the existence of an easy-axis anisotropy and ferromagnetically stacked along the c axis. (ii) With increasing field along the c axis, a 1/3 magnetization plateau is observed, which means that the canted 120° spin structure is transformed into an up-up-down (UUD) spin structure. With even higher fields, the UUD phase further evolves into possible V and V′ phases. (iii) With increasing field along the a axis, the canted 120° spin structure is possibly transformed into an umbrella phase and a V phase. Therefore Na2BaNi(PO4)2 is a rare example of a spin-1 ETLAF with single-crystalline form that exhibits easy-axis spin anisotropy and a series of quantum spin state transitions.

AB - We have grown single crystals of Na2BaNi(PO4)2, a spin-1 equilateral triangular lattice antiferromagnet (ETLAF), and performed magnetic susceptibility, specific heat, and thermal conductivity measurements at ultralow temperatures. The main results are as follows: (i) At zero magnetic field, Na2BaNi(PO4)2 exhibits a magnetic ordering at 430 mK with a weak ferromagnetic moment along the c axis. This suggests a canted 120° spin structure, which is in a plane including the crystallographic c axis due to the existence of an easy-axis anisotropy and ferromagnetically stacked along the c axis. (ii) With increasing field along the c axis, a 1/3 magnetization plateau is observed, which means that the canted 120° spin structure is transformed into an up-up-down (UUD) spin structure. With even higher fields, the UUD phase further evolves into possible V and V′ phases. (iii) With increasing field along the a axis, the canted 120° spin structure is possibly transformed into an umbrella phase and a V phase. Therefore Na2BaNi(PO4)2 is a rare example of a spin-1 ETLAF with single-crystalline form that exhibits easy-axis spin anisotropy and a series of quantum spin state transitions.

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Quantum spin state transitions in the spin-1 equilateral triangular lattice antiferromagnet Na2BaNi(PO4)2

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