Thermodynamics of strongly disordered spin ladders

Details Thermodynamics of strongly disordered spin ladders Thermodynamics of strongly disordered spin ladders

2002-02-20

arxiv.org/abs/cond-mat/0202355v2

Phys. Rev. B 65, 224428 (2002)

Physics

Condensed Matter

Disordered Systems and Neural Networks

Published version, 12 pages, 6 figures

Scientific paper

10.1103/PhysRevB.65.224428

We study antiferromagnetic two-leg spin-1/2 ladders with strong bond randomness, using the real space renormalization group method. We find the low-temperature spin susceptibility of the system follows non-universal power laws, and the ground state spin-spin correlation is short-ranged. Our results suggest that there is no phase transition when the bond randomness increases from zero; for strong enough randomness the system is in a Griffith region with divergent spin susceptibility and short-range spin-spin correlation.

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