Large moment formation and thermodynamic properties of disordered spin ladders with site dilution
نویسندگان
چکیده
Low temperature properties of antiferromagnetic two-leg spin-1/2 ladders with bond randomness and site dilution ~or doping with nonmagnetic impurities! are studied using the real-space renormalization-group technique. We find that for nonzero dopant concentrations the systems are driven into a phase dominated by large effective spins, i.e., the large spin phase. The susceptibility follows a universal Curie-like 1/T behavior at low temperature, regardless of the dopant concentration ~as long as it is nonzero! and the strength of bond randomness. A very similar behavior has been found in ladders that are doped with magnetic impurities that carry spin-1.
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