TY - JOUR
T1 - Generation of large moments in a spin-1 chain with random antiferromagnetic couplings
AU - Yang, Kun
AU - Bhatt, R. N.
PY - 1998
Y1 - 1998
N2 - We study the spin-1 chain with nearest neighbor couplings that are rotationally invariant, but include both Heisenberg and biquadratic exchange, with random strengths. We demonstrate, using perturbative renormalization group methods as well as exact diagonalization of clusters, that the system generates ferromagnetic couplings under certain circumstances even when all the bare couplings are antiferromagnetic. This disorder induced instability leads to formation of large magnetic moments at low temperatures, and is a purely quantum mechanical effect that does not have a classical counterpart. The physical origin of this instability, as well as its consequences, are discussed.
AB - We study the spin-1 chain with nearest neighbor couplings that are rotationally invariant, but include both Heisenberg and biquadratic exchange, with random strengths. We demonstrate, using perturbative renormalization group methods as well as exact diagonalization of clusters, that the system generates ferromagnetic couplings under certain circumstances even when all the bare couplings are antiferromagnetic. This disorder induced instability leads to formation of large magnetic moments at low temperatures, and is a purely quantum mechanical effect that does not have a classical counterpart. The physical origin of this instability, as well as its consequences, are discussed.
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U2 - 10.1103/PhysRevLett.80.4562
DO - 10.1103/PhysRevLett.80.4562
M3 - Article
AN - SCOPUS:0001333610
SN - 0031-9007
VL - 80
SP - 4562
EP - 4565
JO - Physical review letters
JF - Physical review letters
IS - 20
ER -