2019/09/30 by L. Shen, E. Campillo, O. Zaharko +10
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Electron #Excited state #Ground state #Inelastic neutron scattering #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetization #Neutron scattering #Néel temperature #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum spin liquid #Scattering #Spin (aerodynamics) #Spin polarization #Spinon #cond-mat.str-el
paper · pdf · doi:10.1103/physrevresearch.4.013111
published as Physical Review Research 4 (2022) 013111 · 12 pages, 9 figures
openalex publication_date 2022/02/11 · openalex created_date 2022/02/13 · arxiv created 2022/03/03 · arxiv updated 2022/03/04 · openalex updated_date 2026/08/05
We present a systematic inelastic neutron scattering and neutron diffraction study of the magnetic structure of the quasi-1D spin-1/2 magnet SrCo2V2O8, where the interchain coupling in the Neel-type antiferromagnetic ground state breaks the static spin lattice into two independent domains. At zero magnetic field, we observe two new spin excitations with small spectral weights inside the gapped region defined by the spinon bound states. In an external magnetic field along the chain axis, the Neel order is partially destabilized above 2 T and completely suppressed at 3.9 T, above which a quantum disordered Tomonaga-Luttinger liquid (TLL) prevails. We propose that the two new modes at zero field are spinon excitations inside the domain walls. Since they have a smaller gap than those excited in the Neel domains, the underlying spin chains enter the TLL state via a local quantum phase transition at 2 T, making a stable Neel / TLL coexistence until the excitation gap closes in the Neel state at 3.9 T.