Reexamination of Magnetic Susceptibility and Spin Flop at Low-Field in KCuF3.

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  • Sasaki Shinji
    Department of Physics, Faculty of Science, Chiba University, Yayoi–cho, Inage–ku, Chiba 263
  • Narita Naoyuki
    Department of Physics, Faculty of Science, Chiba University, Yayoi–cho, Inage–ku, Chiba 263
  • Yamada Isao
    Department of Physics, Faculty of Science, Chiba University, Yayoi–cho, Inage–ku, Chiba 263

Bibliographic Information

Other Title
  • Reexamination of Magnetic Susceptibilit
  • Reexamination of Magnetic Susceptibility and Spin Flop at Low-Field in KCuF<sub>3</sub>
Published
1995
DOI
  • 10.1143/jpsj.64.4882
Publisher
THE PHYSICAL SOCIETY OF JAPAN

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The exact spin-structure of KCuF3 has been puzzling for a long time. However, recent electron paramagnetic and antiferromagneic resonance (AFMR) studies made on high-quality single crystals revealed that this compound has an eight-sublattice magnetic structure and the substantial easy direction is along [110]p and its equivalent axes. This structure is due to the ∑ ndnn+1· (Sn× Sn+1) interaction between nearest-neighbor spins on the c-axis; the directions of dnn+1 are parallel to [100]p and its equivalent axes, and are therefore orthogonal to each other in the c-plane. The analysis of the AFMR data suggested a spin flop from the [110]p to [1\bar 10]p at H~= 696, Oe. To confirm the spin flop, the magnetization process is investigated, and it is observed at 550, Oe. As a result, the substantial easy direction of spins suggested by the AFMR study is confirmed. In addition, the parallel and perpendicular susceptibilities, χ // and χ ⊥ , are reexamined and are discussed on the basis of a recent improved theory for a one-dimensional Heisenberg antiferromagnet.

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