Journal of the Korean Physical Society

, Volume 62, Issue 12, pp 2041–2045 | Cite as

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

  • Chiori Yokoyama
  • Eiichi Matsuoka
  • Hitoshi Sugawara
  • Takahiro Sakurai
  • Weimin Zhang
  • Susumu Okubo
  • Hitoshi Ohta
  • Hikomitsu Kikuchi
Article

Abstract

We report the synthesis and the magnetic susceptibility of (pipdH)2Cu1−xZnxBr4 (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)2CuBr4 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.

Keywords

Heisenberg AF spin ladder Low-dimensional spin system Impurity effect 

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Copyright information

© The Korean Physical Society 2013

Authors and Affiliations

  • Chiori Yokoyama
    • 1
  • Eiichi Matsuoka
    • 1
  • Hitoshi Sugawara
    • 1
  • Takahiro Sakurai
    • 2
  • Weimin Zhang
    • 3
  • Susumu Okubo
    • 3
  • Hitoshi Ohta
    • 3
  • Hikomitsu Kikuchi
    • 4
  1. 1.Graduate School of ScienceKobe UniversityKobeJapan
  2. 2.Center for Supports to Research and Education ActivitiesKobe UniversityKobeJapan
  3. 3.Molecular Photoscience Research CenterKobe UniversityKobeJapan
  4. 4.Department of Applied PhysicsUniversity of FukuiFukuiJapan

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