Logarithmic corrections from ferromagnetic impurity ending bonds of open antiferromagnetic host chains

Details Logarithmic corrections from ferromagnetic impurity ending bonds of open antiferromagnetic host chains Logarithmic corrections from ferromagnetic impurity ending bonds of open antiferromagnetic host chains

2000-03-06

arxiv.org/abs/cond-mat/0003071v1

Phys. Rev. B 62, 8600 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 7 eps figures

Scientific paper

10.1103/PhysRevB.62.8600

We analyze the logarithmic corrections due to ferromagnetic impurity ending bonds of open spin 1/2 antiferromagnetic chains, using the density matrix renormalization group technique. A universal finite size scaling $\sim {\frac 1 {L \log L}}$ for impurity contributions in the quasi-degenerate ground state energy is demonstrated for a zigzag spin 1/2 chain at the critical next nearest neighbor coupling and the standard Heisenberg spin 1/2 chain, in the long chain limit. Using an exact solution for the latter case it is argued that one can extract the impurity contributions to the entropy and specific heat from the scaling analysis. It is also shown that a pure spin 3/2 open Heisenberg chain belongs to the same universality class.

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