Wednesday, May 8, 2013

1305.1499 (C. Yokoyama et al.)

Nonmagnetic Impurity Effect of the S=1/2 Spin Ladder System
(pipdH)_2Cu_{1-x}Zn_xBr_4
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C. Yokoyama, E. Matsuoka, H. Sugawara, T. Sakurai, W. Zhang, S. Okubo, H. Ohta, H. Kikuchi
We report the synthesis and the magnetic susceptibility of (pipdH)2Cu1-xZnxBr4, which is a nonmagnetic impurity-doped S=1/2 spin ladder system. The samples were synthesized from a solution by using a slow evaporation method. Samples were confirmed to be in a single phase and to have the same crystal structure as the pure system (pipdH)2CuBr4 by using X-ray diffraction measurements. To check the magnetic properties, we performed magnetic susceptibility and magnetization measurements with a SQUID magnetometer. A plot of the inverse magnetic susceptibility indicates the presence of dominant antiferromagnetic coupling. The magnetic susceptibility shows a broad maximum due to low dimensionality and a spin gap behavior related to the two-leg spin ladder at low temperature. The spin gap and the Curie constants of Zn-doped samples, as estimated from an analysis of the magnetic susceptibility, monotonically decrease as the Zn concentration decreases. A nonmagnetic impurity of S=1/2 spin ladder system affects the spin gap.
View original: http://arxiv.org/abs/1305.1499

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