Spin-3/2 random quantum antiferromagnetic chains

Details Spin-3/2 random quantum antiferromagnetic chains Spin-3/2 random quantum antiferromagnetic chains

2003-08-04

arxiv.org/abs/cond-mat/0308036v1

Phys. Rev. B, 68, 020403(R) (2003)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages

Scientific paper

10.1103/PhysRevB.68.020403

We use a modified perturbative renormalization group approach to study the random quantum antiferromagnetic spin-3/2 chain. We find that in the case of rectangular distributions there is a quantum Griffiths phase and we obtain the dynamical critical exponent $Z$ as a function of disorder. Only in the case of extreme disorder, characterized by a power law distribution of exchange couplings, we find evidence that a random singlet phase could be reached. We discuss the differences between our results and those obtained by other approaches.

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