The authors studied the conduction mechanism in an uranium doped low dimensional magnetic system Ca₂CuO₃. This system exhibits the S=1/2 quasi ID antiferromagnetic chains of -Cu-O- with strong magnetic coupling, and demonstrates continuous semiconductor-like behavior with constant covalent insulator character. This paper identifies the conduction is due to thermally activated phonon-assisted electron hopping betwee dopant uranium sites. The parameter á, the characteristic for hopping probability, was determined to be 0.18 Å^-1. This value manifests a relatively stronger hopping probability for Ca₂CuO₃ as compared with other uranium doped ceramics. © 2008 Journal of Magnetics.

Thanh P.Q., Yu S.-C., Nhat H.N.

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