Frustrated antiferromagnetic quantum spin chains for spin length S > 1

Details Frustrated antiferromagnetic quantum spin chains for spin length S > 1 Frustrated antiferromagnetic quantum spin chains for spin length S > 1

1998-05-02

arxiv.org/abs/cond-mat/9805020v1

Physics

Condensed Matter

6 pages, 8 ps figures, uses RevTeX, submitted to PRB

Scientific paper

10.1103/PhysRevB.58.9264

We investigate frustrated antiferromagnetic Heisenberg quantum spin chains at T=0 for S=3/2 and S=2 using the DMRG method. We localize disorder and Lifshitz points, confirming that quantum disorder points can be seen as quantum remnants of classical phase transitions. Both in the S=3/2 and the S=2 chain, we observe the disappearance of effectively free S=1/2 and S=1 end spins respectively. The frustrated spin chain is therefore a suitable system for clearly showing the existence of free end spins S'=[S/2] also in half-integer antiferromagnetic spin chains with S>1/2. We suggest that the first order transition found for S=1 in our previous work is present in all frustrated spin chains with S>1/2, characterized by the disappearance of effectively free end spins with S'=[S/2].

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