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 language | English (US) |
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Pages (from-to) | 7231-7233 |
Number of pages | 3 |
Journal | Journal of Applied Physics |
Volume | 83 |
Issue number | 11 |
DOIs | |
State | Published - 1998 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)