Low Temperature Thermal and Magnetic Properties of Cu-Doped Haldane Gap Antiferromagnet NENP.

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  • Kobayashi Tatsuo C.
    Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka 560
  • Honda Hajime
    Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka 560
  • Koda Akihiro
    Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka 560
  • Amaya Kiichi
    Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka 560

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  • Low Temperature Thermal and Magnetic Pr

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Abstract

Effects of Cu-impurity are studied by heat capacity and susceptibility measurements down to 30, mK on the Haldane-gap antiferromagnet Ni(C2H8N2)2NO2(ClO4) (NENP). We have observed the characteristic heat capacity and susceptibility which show contributions from free spins of the Cu2+-impurities with S=1/2 and the fractional spin S=1/2 states at the ends of the Ni2+(S=1)-chain adjacent to the Cu2+-impurities. The present results are explained completely by the phenomenological Hamiltonian for a trimmer of S=1/2 proposed by the ESR study on this system.

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