Spin excitation continua observed in neutron scattering studies are often considered to be strong evidence of quantum spin liquid formation.In a disorder-free magnetic compound with a quantum spin liquid ground state,...Spin excitation continua observed in neutron scattering studies are often considered to be strong evidence of quantum spin liquid formation.In a disorder-free magnetic compound with a quantum spin liquid ground state,the elementary excitation is no longer the conventional spin waves(magnons).Instead,the magnons fractionalize into spinons,producing a characteristic two-spinon continuum.However,it remained uncertain whether a clean,ordered antiferromagnet could exhibit a continuous spectrum similar to that of a quantum spin liquid.This paper presents evidence of a spin excitation continuum in the magnetically ordered state of Na_(2)BaCo(PO_(4))_(2),where free spinons are absent.This challenges the interpretation of such a continuum as a definitive signature of a quantum spin liquid in new material studies.展开更多
基金supported by the National Key Research and Development Program of China(grant nos.2021YFA1400400,2022YFA1402204,and 2024YFA1408303)the National Natural Science Foundation of China(grant nos.12134020,12104255,12204223,12374124,and 12374146)+2 种基金the Open Fund of the China Spallation Neutron Source Songshan Lake Science City(grant no.KFKT2023A06)the Fundamental Research Funds for the Central Universities(grant no.226-2024-00068)the Guangdong Provincial Quantum Science Strategic Initiative(grant nos.GDZX2401006 and GDZX2401007).
文摘Spin excitation continua observed in neutron scattering studies are often considered to be strong evidence of quantum spin liquid formation.In a disorder-free magnetic compound with a quantum spin liquid ground state,the elementary excitation is no longer the conventional spin waves(magnons).Instead,the magnons fractionalize into spinons,producing a characteristic two-spinon continuum.However,it remained uncertain whether a clean,ordered antiferromagnet could exhibit a continuous spectrum similar to that of a quantum spin liquid.This paper presents evidence of a spin excitation continuum in the magnetically ordered state of Na_(2)BaCo(PO_(4))_(2),where free spinons are absent.This challenges the interpretation of such a continuum as a definitive signature of a quantum spin liquid in new material studies.
