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Emergent O(4) symmetry at the phase transition from plaquette-singlet to antiferromagnetic order in quasi-two-dimensional quantum magnets

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Chinese Physics B 2021年第6期30卷 570-582页

作者： Guangyu Sun nvsen ma Bowen Zhao Anders WSandvik Zi Yang Meng Beijing National Laboratory for Condensed matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China School of Physics Key Laboratory of Micro-Nano Measurement-Manipulation and PhysicsBeihang UniversityBeijing 100191China Department of Physics Boston University590 Commonwealth AvenueBostonMassachusetts 02215USA Department of Physics and HKU-UCAS Joint Institute of Theoretical and Computational Physics The University of Hong KongHong KongChina

Recent experiments [Guo et al., Phys. Rev. Lett. 124 206602(2020)] on thermodynamic properties of the frustrated layered quantum magnet SrCu_(2)(BO_(3))_(2)-the Shastry–Sutherland material-have provided strong evidence for a lowtemperature phase transition between plaquette-singlet and antiferromagnetic order as a function of pressure. Further motivated by the recently discovered unusual first-order quantum phase transition with an apparent emergent O(4) symmetry of the antiferromagnetic and plaquette-singlet order parameters in a two-dimensional "checkerboard J-Q" quantum spin model[Zhao et al., Nat. Phys. 15 678(2019)], we here study the same model in the presence of weak inter-layer couplings. Our focus is on the evolution of the emergent symmetry as the system crosses over from two to three dimensions and the phase transition extends from strictly zero temperature in two dimensions up to finite temperature as expected in SrCu_(2)(BO_(3))_(2).Using quantum Monte Carlo simulations, we map out the phase boundaries of the plaquette-singlet and antiferromagnetic phases, with particular focus on the triple point where these two ordered phases meet the paramagnetic phase for given strength of the inter-layer coupling. All transitions are first-order in the neighborhood of the triple point. We show that the emergent O(4) symmetry of the coexistence state breaks down clearly when the interlayer coupling becomes sufficiently large, but for a weak coupling, of the magnitude expected experimentally, the enlarged symmetry can still be observed at the triple point up to significant length scales. Thus, it is likely that the plaquette-singlet to antiferromagnetic transition in SrCu_(2)(BO_(3))_(2) exhibits remnants of emergent O(4) symmetry, which should be observable due to additional weakly gapped Goldstone modes.

关键词： quantum phase transitions quantum spin systems emergent symmetry quantum Monte Carlo simulations

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Zigzag magnetic order in a novel tellurate compound Na_(4-δ)NiTeO_6 with S=1 chains

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Science China(Physics,Mechanics & Astronomy) 2022年第9期65卷 128-137页

作者： Cheng Su Xu-Tao Zeng Yi Li nvsen ma Zhengwang Lin Chuandi Zhang Chin-Wei Wang Ziyu Chen Xingye Lu Wei Li Xian-Lei Sheng Wentao Jin School of Physics Beihang UniversityBeijing 100191China Center for Advanced Quantum Studies and Department of Physics Beijing Normal UniversityBeijing 100875China Australian Nuclear Science and Technology Organisation Lucas Heights NSW 2234Australia CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China

Na_(4-δ)Ni Te O_(6) is a rare example in the transition-metal tellurate family of realizing an S=1 spin-chain *** performing neutron powder diffraction measurements,the ground-state magnetic structure of Na_(4-δ)Ni Te O_(6) is *** measurements reveal that below T_N~6.8(2)K,the Ni^(2+) moments form a screwed ferromagnetic(FM)spin-chain structure running along the crystallographic a axis but these FM spin chains are coupled antiferromagnetically along the b and c directions,giving rise to a magnetic propagation vector of k=(0,1/2,1/2).This zigzag magnetic order is well supported by first-principles *** moment size of Ni^(2+) spins is determined to be 2.1(1) μ_(B) at 3 K,suggesting a significant quenching of the orbital moment due to the crystalline electric field(CEF)*** previously reported metamagnetic transition near H_(c)~0.1 T can be understood as a field-induced spin-flip *** relatively easy tunability of the dimensionality of its magnetism by external parameters makes Na_(4-δ)Ni Te O_(6)a promising candidate for further exploring various types of novel spin-chain physics.

关键词： zigzag magnetic order spin chain neutron diffraction first-principles calculations

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