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_...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.展开更多
GeTe that exhibits a strong anharmonicity and a ferroelectric phase transition between the rhombohedral and cubic structures has emerged as one of the leading thermoelectric materials.Herein,combining molecular dynami...GeTe that exhibits a strong anharmonicity and a ferroelectric phase transition between the rhombohedral and cubic structures has emerged as one of the leading thermoelectric materials.Herein,combining molecular dynamics simulations and inelastic neutron scattering measurements,the lattice dynamics in GeTe have been investigated to reveal the soft-mode mechanisms across the phase transition.We have constructed a first-principles-based machine-learning interatomic potential,which successfully captures the dynamical ferroelectric phase transition of GeTe by adopting the neural network technique.Although the low-energy acoustic phonons remain relatively unaffected at elevated temperatures,the high-energy optical,and longitudinal acoustic phonons demonstrate strong renormalizations as evidenced from the vibrational phonon spectra,which are attributed to the large anharmonicity accompanying the phase transition.Furthermore,our results reveal a nonmonotonic temperature dependence of the soft-modes beyond the perturbative regime.The insight provided by this work into the soft-modes may pave the way for further phonon engineering of GeTe and the related thermoelectrics.展开更多
Following publication of this article[1],the page number in ref.55 was incorrect and should have been 10009 rather than 10.In the Author contribution section of this article,the authors get the support from Prof.Gang ...Following publication of this article[1],the page number in ref.55 was incorrect and should have been 10009 rather than 10.In the Author contribution section of this article,the authors get the support from Prof.Gang Chen,so it should be revised as:“QMZ and JM conducted the study.JSL and ZZ grew NaYbS2 polycrystalline samples and single crystals.展开更多
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)+2 种基金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.17303819the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB33010100)。
文摘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This work is supported by the Zhejiang Provincial Natural Science Foundation(LR19A040001)the Research Grants Council of Hong Kong(17201019 and 17300018)+2 种基金the National Natural Science Foundation of China(11874313)the National Key Research and Development Program of China(2019YFA0209904)The authors are grateful for the research computing facilities offered by ITS,HKU.
文摘GeTe that exhibits a strong anharmonicity and a ferroelectric phase transition between the rhombohedral and cubic structures has emerged as one of the leading thermoelectric materials.Herein,combining molecular dynamics simulations and inelastic neutron scattering measurements,the lattice dynamics in GeTe have been investigated to reveal the soft-mode mechanisms across the phase transition.We have constructed a first-principles-based machine-learning interatomic potential,which successfully captures the dynamical ferroelectric phase transition of GeTe by adopting the neural network technique.Although the low-energy acoustic phonons remain relatively unaffected at elevated temperatures,the high-energy optical,and longitudinal acoustic phonons demonstrate strong renormalizations as evidenced from the vibrational phonon spectra,which are attributed to the large anharmonicity accompanying the phase transition.Furthermore,our results reveal a nonmonotonic temperature dependence of the soft-modes beyond the perturbative regime.The insight provided by this work into the soft-modes may pave the way for further phonon engineering of GeTe and the related thermoelectrics.
文摘Following publication of this article[1],the page number in ref.55 was incorrect and should have been 10009 rather than 10.In the Author contribution section of this article,the authors get the support from Prof.Gang Chen,so it should be revised as:“QMZ and JM conducted the study.JSL and ZZ grew NaYbS2 polycrystalline samples and single crystals.
