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Spin reduction transition in spin-3/2 random Heisenberg chains

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. doi:10.1103/PhysRevB.66.060402.

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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.

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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.
Issue or Number:6
Record Number:CaltechAUTHORS:REFprb02
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7132
Deposited By: Archive Administrator
Deposited On:09 Jan 2007
Last Modified:08 Nov 2021 20:39

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