Nonmagnetic impurity effect of the S = 1/2 spin ladder system (pipdH)2Cu1−xZnxBr4

• Published in: Journal of the Korean Physical Society Vol. 62; no. 12; pp. 2041 - 2045
• Main Authors: Yokoyama, Chiori, Matsuoka, Eiichi, Sugawara, Hitoshi, Sakurai, Takahiro, Zhang, Weimin, Okubo, Susumu, Ohta, Hitoshi, Kikuchi, Hikomitsu
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.07.2013; 한국물리학회
• Subjects: Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Theoretical; 물리학; Heisenberg AF spin ladder; Low-dimensional spin system; Impurity effect
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.62.2041

We report the synthesis and the magnetic susceptibility of (pipdH) 2 Cu 1− x Zn x Br 4 (pipd=piperidinium), 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) 2 CuBr 4 by using X-ray diffraction measurements. To check the magnetic properties, we performed magnetic susceptibility and magnetization measurements with a superconducting quantum interference device 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 Δ 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.