Two-dimensional quantum universality in the spin-1/2 triangular-lattice quantum antiferromagnet Na2BaCo(PO4)2

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dc.contributor.authorSheng, JMen_AU
dc.contributor.authorWang, Len_AU
dc.contributor.authorCandini, Aen_AU
dc.contributor.authorJiang, Wen_AU
dc.contributor.authorHuang, Len_AU
dc.contributor.authorXi, Ben_AU
dc.contributor.authorZhao, Jen_AU
dc.contributor.authorGe, Hen_AU
dc.contributor.authorZhao, Nen_AU
dc.contributor.authorFu, Yen_AU
dc.contributor.authorRen, Jen_AU
dc.contributor.authorYang, Jen_AU
dc.contributor.authorMiao, Pen_AU
dc.contributor.authorTong, Xen_AU
dc.contributor.authorYu, Den_AU
dc.contributor.authorWang, Sen_AU
dc.contributor.authorLiu, Qen_AU
dc.contributor.authorKofu, Men_AU
dc.contributor.authorMole, RAen_AU
dc.contributor.authorBiasiol, Gen_AU
dc.contributor.authorYu, DHen_AU
dc.contributor.authorZaliznyak, IAen_AU
dc.contributor.authorMei, JWen_AU
dc.contributor.authorWu, Len_AU
dc.date.accessioned2025-01-09T00:45:10Zen_AU
dc.date.available2025-01-09T00:45:10Zen_AU
dc.date.issued2022-12-15en_AU
dc.date.statistics2024-10-30en_AU
dc.description.abstractAn interplay of geometrical frustration and strong quantum fluctuations in a spin-1/2 triangular-lattice antiferromagnet (TAF) can lead to exotic quantum states. Here, we report the neutron-scattering, magnetization, specific heat, and magnetocaloric studies of the recently discovered spin-1/2 TAF Na2BaCo(PO4)2, which can be described by a spin-1/2 easy axis XXZ model. The zero-field neutron diffraction experiment reveals an incommensurate antiferromagnetic ground state with a significantly reduced ordered moment of about 0.54(2) μB/Co. Different magnetic phase diagrams with magnetic fields in the ab plane and along the easy c-axis were extracted based on the magnetic susceptibility, specific heat, and elastic neutron-scattering results. In addition, two-dimensional (2D) spin dispersion in the triangular plane was observed in the high-field polarized state, and microscopic exchange parameters of the spin Hamiltonian have been determined through the linear spin wave theory. Consistently, quantum critical behaviors with the universality class of d = 2 and νz = 1 were established in the vicinity of the saturation field, where a Bose–Einstein condensation (BEC) of diluted magnons occurs. The newly discovered quantum criticality and fractional magnetization phase in this ideal spin-1/2 TAF present exciting opportunities for exploring exotic quantum phenomena. © 2022 the Author(s). Published by PNAS. This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).en_AU
dc.description.sponsorshipWe would like to thank A. M. Tsvelik, D. Yamamoto, Z. T. Wang, and J. C. Wang for the useful discussions and L. Sorba (Istituto Nanoscienze, Italy) for the support about the Hall sensor magnetometer substrate; X. F. Xiao, and J. Y. Zhu from Quantum Design for the support of the low-temperature measurements; and G. Davidson for the great support in setting up and operating the superconducting magnet and the dilution insert throughout the experiment on Pelican. The authors would also like to acknowledge the beam time awarded by Australia’s Nuclear Science and Technology Organisation (ANSTO) through proposal No. P9457. The research was supported by the National Key Research and Development Program of China (Grant No. 2021YFA1400400), National Key R&D Program of China (Grant No. 2020YFA0308900), the National Natural Science Foundation of China (Grants No. 12134020, No. 11974157, No. 12174175, No. 12104255, No. 11774300, No. 11874188, and No. 12047501), the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2021B1515120015), and the Science, Technology and Innovation Commission of Shenzhen Municipality (No. ZDSYS20190902092905285). The Major Science and Technology Infrastructure Project of Material Genome Big-science Facilities Platform was supported by Municipal Development and Reform Commission of Shenzhen. Work at Brookhaven National Laboratory was supported by Office of Basic Energy Sciences (BES), Division of Materials Sciences and Engineering, US Department of Energy (DOE), under contract DE-SC0012704. Work at Sciences (CAS) and the China Spallation Neutron Source (CSNS) was supported by the National Nature Science Foundation of China (No. 11875265, 12104255), the ninth batch of innovation and entrepreneurship leading talents (innovation category) in 2019, Guangdong Natural Science Funds for Distinguished Young Scholar. The neutron experiment at the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex (J-PARC) was performed under a user program (Proposal No. 2021B0185).en_AU
dc.format.mediumPrint-Electronicen_AU
dc.identifier.articlenumbere2211193119en_AU
dc.identifier.citationSheng, J., Wang, L., Candini, A., Jiang, W., Huang, L., Xi, B., Zhao, J., Ge, H., Zhao, N., Fu, Y., Ren, J., Yang, J., Miao, P., Tong, X., Yu, D., Wang, S., Liu, Q., Kofu, M., Mole, R., Biasiol, G., Yu, D., Zaliznyak, I. A., Mei, J.-W., & Wu, L. (2022). Two-dimensional quantum universality in the spin-1/2 triangular-lattice quantum antiferromagnet Na2BaCo(PO4)2. Proceedings of the National Academy of Sciences, 119(51), e2211193119. doi:10.1073/pnas.2211193119en_AU
dc.identifier.issn0027-8424en_AU
dc.identifier.issn1091-6490en_AU
dc.identifier.issue51en_AU
dc.identifier.journaltitleProceedings of the National Academy of Sciences of the United States of Americaen_AU
dc.identifier.urihttps://doi.org/10.1073/pnas.2211193119en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15856en_AU
dc.identifier.volume119en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherProceedings of the National Academy of Sciencesen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectSpinen_AU
dc.subjectSodiumen_AU
dc.subjectBariumen_AU
dc.subjectCobalten_AU
dc.subjectPoloniumen_AU
dc.subjectQuantum mechanicsen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectMagnetizationen_AU
dc.subjectCrystal structureen_AU
dc.subjectPhase transformationsen_AU
dc.subjectMagnonsen_AU
dc.titleTwo-dimensional quantum universality in the spin-1/2 triangular-lattice quantum antiferromagnet Na2BaCo(PO4)2en_AU
dc.typeJournal Articleen_AU
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