摘要
Spin-orbit coupling is an important ingredient to regulate the many-body physics,especially for many spin liquid candidate materials such as rare-earth magnets and Kitaev materials.The rare-earth chalcogenides NaYbCh_(2)(Ch=O,S,Se)is a congenital frustrating system to exhibit the intrinsic landmark of spin liquid by eliminating both the site disorders between Na+and Yb^(3+)ions with the big ionic size difference and the Dzyaloshinskii-Moriya interaction with the perfect triangular lattice of the Yb^(3+)ions.The temperature versus magnetic-field phase diagram is established by the magnetization,specific heat,and neutron-scattering measurements.Notably,the neutron diffraction spectra and the magnetization curve might provide microscopic evidence for a series of spin configuration for in-plane fields,which include the disordered spin liquid state,120°antiferromagnet,and one-half magnetization state.Furthermore,the ground state is suggested to be a gapless spin liquid from inelastic neutron scattering,and the magnetic field adjusts the spin orbit coupling.Therefore,the strong spin-orbit coupling in the frustrated quantum magnet substantially enriches low-energy spin physics.This rare-earth family could offer a good platform for exploring the quantum spin liquid ground state and quantum magnetic transitions.
基金
supported by the Ministry of Science and Technology of China(Grant No.2022YFA1402700,2018YFGH000095)
the NSF of China(Grant No.U2032213,11774223,12274186,11774352,11974244,U1832214,and U1932215)
the interdisciplinary program Wuhan National High Magnetic Field Center(Grant No.WHMFC 202122)
Huazhong University of Science and Technology,and the Research Grants Council of Hong Kong with General Research Fund Grant No.17303819
the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB33010100)。
