Phys. Rev. B 65, 224428 (2002) [10 pages]Thermodynamics of strongly disordered spin laddersReceived 20 February 2002; revised 8 April 2002; published 10 June 2002 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 nonuniversal power laws, and that 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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.65.224428
DOI:
10.1103/PhysRevB.65.224428
PACS:
75.10.Jm, 75.10.Nr
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