Abstract
According to Haldane’s conjecture, there is a spin gap of the excitation spectrum in integerHeisenberg spin chains whereas half-integer spin chains have a gapless excitationspectrum. In an earlier publication (Hung and Gong 2005 Phys. Rev. B 71 054413), theHaldane gap and other properties of the spin-1 system are explained using aspin-1/2 alternating bond chain model. The ferromagnetic–ferromagnetic–antiferromagnetic Heisenbergspin-1/2 chain is expected to behave similarly to the uniformspin-3/2 Heisenberg chain for strong ferromagnetic coupling. And the general nonuniformspin-1/2 chain may be used to explain the properties of the integer and half-integer highspin-S chains, consistently. In this paper, we provide a detailed numerical verification for theabove problems.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
