Abstract
Spin-gap behaviors observed in the temperature dependence of the magnetic susceptibility χ and the specific heat C of Na 3Cu 2SbO 6 with (distorted) honeycomb structure are analyzed in detail. The behavior can be understood by considering both the significant Jahn–Teller distortion in the compound and the characteristics of the shape of the electron orbits, in which the spins exist. We point out that the antiferromagnetic–ferromagnetic alternating chain model successfully describes the observed magnetic behaviors of Na 3Cu 2SbO 6.
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