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Continuum of spin excitations in an ordered magnet

Jieming Sheng,Le Wang,Wenrui Jiang,Han Ge,Nan Zhao,Tiantian Li,Maiko Kofu,Dehong Yu,Wei Zhu,Jia-Wei Mei,Zhentao Wang,Liusuo Wu

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.