J. Phys. Soc. Jpn. 75 (2006) 084707 (6 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Spin-Gap Behavior of Na₃Cu₂SbO₆ with Distorted Honeycomb Structure

Yoko Miura, Riu Hirai, Yoshiaki Kobayashi and Masatoshi Sato

(Received April 24, 2006; Accepted May 29, 2006; Published July 25, 2006)

The spin-gap behavior observed in the temperature dependences of the magnetic susceptibility χ and the specific heat C of Na₃Cu₂SbO₆ with a (distorted) honeycomb structure is analyzed in detail. The behavior is commonly observed in similar systems A₃Cu₂SbO₆ and Na₂Cu₂TeO₆ (A=Na, Li), and can be understood by considering both the significant Jahn–Teller distortion in the compounds and the characteristics of the shape of the electron orbits, in which spins exist. The behavior is contrasted with the antiferromagnetic transition in systems of Na₃T₂SbO₆ and Na₂T₂TeO₆ (T=Co, Ni). We point out that the antiferromagnetic–ferromagnetic alternating chain model successfully describes the observed magnetic behavior of Na₃Cu₂SbO₆. ©2006 The Physical Society of Japan

KEYWORDS: Na₃Cu₂SbO₆, honeycomb system, spin gap
URL: http://jpsj.ipap.jp/link?JPSJ/75/084707/
DOI: 10.1143/JPSJ.75.084707

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