Physics – Condensed Matter
Scientific paper
1997-02-18
J. Phys. Soc. Jpn. 66 (1997) 568
Physics
Condensed Matter
4 pages LaTeX including 3 PS figures
Scientific paper
10.1143/JPSJ.66.568
We study effects of interladder coupling on critical magnetic properties of spin ladder systems doped with small concentrations of nonmagnetic impurities, using the scaling theory together with quantum Monte Carlo (QMC) calculations. Scaling properties in a wide region in the parameter space of the impurity concentration x and the interladder coupling are governed by the quantum critical point (QCP) of the undoped system for the transition between antiferromagnetically ordered and spin-gapped phases. This multi-dimensional and strong-coupling region has characteristic power-law dependences on x for magnetic properties such as the N\'eel temperature. The relevance of this criticality for understanding experimental results of ladder compounds is stressed.
Iino Youichirou
Imada Masatoshi
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