Spinon continuum in the Heisenberg quantum chain compound Sr2V3O9
Abstract
Magnetic excitations in the spin chain candidate Sr2V3O9 have been investigated by inelastic neutron scattering on a single crystal sample. A spinon continuum with a bandwidth of 22 meV is observed along the chain formed by alternating magnetic V4+ and nonmagnetic V5+ ions. Incipient magnetic Bragg peaks due to weak ferromagnetic interchain couplings emerge when approaching the magnetic transition at TN 5.3 K while the excitations remain gapless within the instrumental resolution. Comparisons to the Bethe ansatz, density matrix renormalization group (DMRG) calculations, and effective field theories confirm Sr2V3O9 as a host of weakly coupled S = 1/2 chains dominated by antiferromagnetic intrachain interactions of 7.1(1) meV.
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