Non-Heisenberg couplings and ferromagnetic instability in a random antiferromagnetic spin-1 chain

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Abstract

A random antiferromagnetic spin-1 chain with both Heisenberg and biquadratic nearest neighbor couplings is found to exhibit a novel ferromagnetic-like instability at low energies, if there is competition between the Heisenberg and biquadratic couplings, even though each individual nearest neighbor coupling is such as to produce a singlet ground state for the isolated pair. This instability leads to the generation of ferromagnetic couplings, and thus to the formation of weakly coupled large moments at low temperatures. A perturbative calculation (up to 4th order) is performed to investigate whether such a situation is physically realizable in spin-1 systems.

Original languageEnglish (US)
Pages (from-to)7231-7233
Number of pages3
JournalJournal of Applied Physics
Volume83
Issue number11
DOIs
StatePublished - Jan 1 1998

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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