Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1998-01-28
Phys. Rev. B 57 (1998) R8091
Physics
Condensed Matter
Statistical Mechanics
4 pages, Revtex, with 4 eps figures
Scientific paper
10.1103/PhysRevB.57.R8091
The ground state magnetization curve around the critical magnetic field $H_c$ of quantum spin chains with the spin gap is investigated. We propose a size scaling method to estimate the critical exponent $\delta$ defined as $m\sim |H-H_c|^{1/\delta}$ from finite cluster calculation. The applications of the method to the S=1 antiferromagnetic chain and S=1/2 bond alternating chain lead to a common conclusion $\delta =2$. The same result is derived for both edges of the magnetization plateau of the S=3/2 antiferromagnetic chain with the single ion anisotropy.
Sakai Tôru
Takahashi Minoru
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