Spin-gap behavior has been observed for the first time in the layered tetragonal compound Na2Ti2Sb2O. Na2Ti2Sb2O shows a sharp discontinuity in magnetic susceptibility at 150 K, reminisent of behavior observed in the spin-Peierls compound CuGeO3. Na2Ti2Sb2O also shows a discontinuity in temperature-dependent resistivity at the magnetic transition and metallic behavior for all other temperatures, 5.7 mΩ·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.
ASJC Scopus subject areas
- Inorganic Chemistry
- Physical and Theoretical Chemistry
- Materials Chemistry