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No.4(pp.115-181)

Home > Issues > Volume 13 (2008) > No.4(pp.115-181)

Phonon-Assisted Electron Hopping Conduction in the Uranium Doped One-Dimensional Antiferromagnet Ca₂CuO₃

Journal of Magnetics, Volume 13, Number 4, 31 Dec 2008, Pages 132-135

Phung Quoc Thanh(Center for Materials Science, College of Science, Vietnam National University), Seong-Cho Yu*

(Department of Physics, Chungbuk National University), Hoang-Nam Nhat(Center for Materials Science, College of Science, Vietnam National University)

Abstract

The authors studied the conduction mechanism in an uranium doped low dimensional magnetic system Ca₂CuO₃. This system exhibits the S=1/2 quasi 1D 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 between dopant uranium sites. The parameter a, the characteristic for hopping probability, was determined to be 0.18Å^-1 . This value manifests a relatively stronger hopping probability for Ca₂CuO₃as compared with other uranium doped ceramics.

Keywords: uranium; phonon-assisted; conduction; antiferromagnet

DOI: 10.4283/JMAG.2008.13.4.132

Full Text: PDF

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