Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonmagnetic Impurity Effect of the S=1/2 Spin Ladder System
  (pipdH)_2Cu_{1-x}Zn_xBr_4   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.

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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph