Nonmagnetic Impurity Effects on S=1/2 Heisenberg Ladder Cu2(C5H12N2)2Cl4

Hiroyuki Deguchi, Shunsaku Sumoto, Seishi Takagi, Masaki Mito, Tatsuya Kawae, Kazuyoshi Takeda, Hiroyuki Nojiri, Takuo Sakon, Mitsuhiro Motokawa, Kazuyoshi Takeda

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Magnetic measurements have been performed to investigate nonmagnetic impurity effects on a Zn-doped ladder system (Cui1-ϰZnϰ)2(C5H12N2)2Cl4. The paramagnetic contribution in the susceptibility ϰˊ of the Zn-doped system increases with increasing ϰ below the gap temperature. The susceptibility obeys the Curie law in the temperature range between 0.5 K and 2 K. However, at temperatures below 0.5 K. ϰˊT drops with decreasing temperature, which suggests the crossover in the Curie constant as predicted by Sigrist and Furusaki [J. Phys. Soc. Jpn. 65 (1996) 2385]. Magnetization curves of the Zn-doped system are compared with that of the pure system. The impurity-induced spin behaves like a paramagnetic S= 1/2 spin and the spin-gap state survives even in the Zn-doped system with the content ϰ up to 0.117. These results seem to originate from the weak interladder interaction of the system.

Original languageEnglish
Pages (from-to)3707-3710
Number of pages4
Journaljournal of the physical society of japan
Issue number11
Publication statusPublished - 1998

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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