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Quantum Phase Transitions in a Quasi-One-Dimensional Ising Quantum Magnet in Transverse Fields



Xiaowen Zhang, Zheng He, Yiqing Hao, Yao Shen, Shoudong Shen, Yu Feng, Guangyong Xu, Nicholas Butch, Goran J. Nilsen, Wenbin Wang, Jun Zhao


We report neutron scattering and thermodynamic measurements of the quasi-one-dimensional Ising magnet SrCo2V2O8 under transverse fields along the tetragonal a/b direction. Our experiments reveal a Neel-type magnetic order in zero field, which successively changes in an unconventional manner in applied fields. The detailed evolution of the non-collinear magnetic order in magnetic fields can be understood by considering the competition between the intrinsic magnetic interactions, uniform transverse field, and effective staggered field. Moreover, a series of gapped discrete confined-spinon modes are observed in zero field. With increasing field, the spin gap progressively softens, reaching a minimum value at 7 T where the Neel-type magnetic ordering moment is completely suppressed. This corresponds to the three-dimensional (3D) quantum critical point (QCP). In magnetic fields below the critical point of 7 T, the discrete modes evolve in a similar manner as that of the sister compound BaCo2V2O8 where possible E8 excitations were recently reported. The implications for multiple QCPs in this class of material are discussed.
Physical Review B


quantum magnet, neutron scattering, quasi-one-dimensional


Zhang, X. , He, Z. , Hao, Y. , Shen, Y. , Shen, S. , Feng, Y. , Xu, G. , Butch, N. , Nilsen, G. , Wang, W. and Zhao, J. (2021), Quantum Phase Transitions in a Quasi-One-Dimensional Ising Quantum Magnet in Transverse Fields, Physical Review B (Accessed August 9, 2022)
Created April 14, 2021, Updated October 1, 2021