Investigations on Bi2CuO4: a quasi-one-dimensional oxide system

Sreedhar, K. ; Ganguly, P. ; Ramasesha, S. (1988) Investigations on Bi2CuO4: a quasi-one-dimensional oxide system Journal of Physics C: Solid State Physics, 21 (6). pp. 1129-1136. ISSN 0022-3719

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The potential of Bi2CuO4 as the first oxide system to show a linear-chain magnetic behaviour is examined. Electron diffraction studies do not resolve the previously reported ambiguity regarding its space group. The magnetic susceptibility data at high temperatures are best fitted to a uniform antiferromagnetic spin-½ Heisenberg chain. At low temperatures, however, neither the uniform nor the alternating Heisenberg antiferromagnetic model fits the data. Magnetic susceptibility data over the entire temperature range can be fitted if one assumes dimeric units with a nearly degenerate second singlet state close to the ground state, these states being separated from an excited triplet state by an energy gap. A simple heuristic model of a dimer that gives such an energy level spectrum is examined.

Item Type:Article
Source:Copyright of this article belongs to Institute of Physics Publishing.
ID Code:13778
Deposited On:12 Nov 2010 14:45
Last Modified:31 May 2011 09:54

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