Refael, Gil and Kehrein, Stefan and Fisher, Daniel S. (2002) Spin reduction transition in spin-3/2 random Heisenberg chains. Physical Review B, 66 (6). Art. No. 060402. ISSN 0163-1829 http://resolver.caltech.edu/CaltechAUTHORS:REFprb02
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Random spin-3/2 antiferromagnetic Heisenberg chains are investigated using an asymptotically exact renormalization group. Randomness is found to induce a quantum phase transition between two random-singlet phases. In the strong randomness phase the effective spins at low energies are Seff=3/2, while in the weak randomness phase the effective spins are Seff=1/2. Separating them is a quantum critical point near which there is a nontrivial mixture of spin-1/2, spin-1, and spin-3/2 effective spins at low temperatures.
|Additional Information:||©2002 The American Physical Society Received 6 June 2002; published 2 August 2002 This work has been supported in part by the National Science Foundation via Grant Nos. DMR-9976621 and DMR-9809334. S.K. was also supported by a DFG Fellowship and through Grant No. SFB 484 of the DFG. G.R. would like to thank J. P. Sethna for useful discussions.|
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|Deposited On:||09 Jan 2007|
|Last Modified:||26 Dec 2012 09:29|
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