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Phase Transition and Spin-gap Behavior in a Layered Tetragonal Pnictide Oxide

✍ Scribed by E.A. Axtell III; Tadashi Ozawa; Susan M. Kauzlarich; Rajiv R.P. Singh

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 234 KB
Volume: 134
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1997.7715

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✦ Synopsis

Spin-gap behavior has been observed for the first time in the layered tetragonal compound Na 2 Ti 2 Sb 2 O. Na 2 Ti 2 Sb 2 O shows a sharp discontinuity in magnetic susceptibility at 150 K, reminisent of behavior observed in the spin-Peierls compound CuGeO 3 . Na 2 Ti 2 Sb 2 O also shows a discontinuity in temperature-dependent resistivity at the magnetic transition and metallic behavior for all other temperatures, 5.7 m • cm at room temperature. Ti-Sb-Ti superexchange is proposed to be favored over Ti-O-Ti superexchange, based on the high-temperature magnetic susceptibility data and on the identity of the magnetic orbitals.

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