Pressure Effects of an S=1 Heisenberg Antiferromagnetic Bond Alternating Chain.

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  • Takeda Kazuyoshi
    Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University, Fukuoka 812-8581 Institute of Environmental Systems, Faculty of Engineering, Kyushu University, Fukuoka 812-8581
  • Mito Masaki
    Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University, Fukuoka 812-8581
  • Fujita Osamu
    Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University, Fukuoka 812-8581
  • Hitaka Masako
    Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University, Fukuoka 812-8581
  • Takagi Seishi
    Department of Electronics, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550
  • Kawae Tatsuya
    Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University, Fukuoka 812-8581
  • Deguchi Hiroyuki
    Department of Electronics, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550

Bibliographic Information

Other Title
  • Pressure Effects of an<i>S</i>= 1 Heisenberg Antiferromagnetic Bond Alternating Chain
Published
2001
DOI
  • 10.1143/jpsj.70.1375
Publisher
THE PHYSICAL SOCIETY OF JAPAN

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Description

By the measurement of magnetic susceptibility under pressures (P) up to 8 kbar, we investigated pressure effects of the S = 1 Heisenberg antiferromagnetic bond alternating chain compound [{Ni(333-tet)(μ-N3)}n](ClO4)n (333-tet denotes N,N'-bis(3-aminopropyl)-1,3-propanediamine), whose alternating interaction ratio (α) at ambient pressure is very close to the theoretical value for the gapless point (αc ≅ 0.59). There are two kinds of intrachain interactions due to bond alternation (J1 and J2), both of which are increased linearly against the pressure. At P = 8 kbar those magnitudes exceed 1.4 times of those at ambient pressure. The magnitude of α ≡ J2/J1, however, does not change largely. The normalized magnetic susceptibility χ | J1|/kB around kBT/| J1| = 0.1 has the maximum value at P = 2 kbar, and this suggests the possibility of the slight changes of α and D.

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