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Cathodoluminescence microscopy of superconducting and non-superconducting Tl_2Ba_2CuO_(6+ δ) polycrystals

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Díaz-Guerra Viejo, Carlos and Piqueras de Noriega, Javier and Opagiste, C. (1996) Cathodoluminescence microscopy of superconducting and non-superconducting Tl_2Ba_2CuO_(6+ δ) polycrystals. Physica C, 259 (1-feb). pp. 121-130. ISSN 0921-4534

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Official URL: http://dx.doi.org/10.1016/0921-4534(96)00055-X




Abstract

Luminescence properties of Tl_2Ba_2CuO_(6+ δ) samples with different superconducting transition temperatures have been studied by cathodoluminescence (CL) in the scanning electron microscope. Independent of the crystal structure, tetragonal or orthorhombic, the Cl spectra show two resolved bands at about 430 nm (2.9 eV) and 540 nm (2.3 eV), respectively. The results show that the 2.3 eV emission is related to oxygen content and is more intense in low-oxygen content superconducting samples. It is proposed that this band is related to a complex center involving oxygen vacancies. A comparison of spectra from Tl_2Ba_2CuO_(6+ δ) and from precursors used in the synthesis (CuO_x, Tl_2Ba_2O_5) has been carried out.


Item Type:Article
Additional Information:

© 1996 Elsevier Science B.V.
CDG acknowledges MEC for a FPI research grant. This work has been supported by DGICYT (Project PB93-1256).

Uncontrolled Keywords:Scanning Electron-Microscope, High-Tc Superconductors, Cu-O, YBa_2Cu_3O_(7-X), Luminescence, Phase, Films, Tl_2Ba_2Cu_1O_6
Subjects:Sciences > Physics > Materials
ID Code:26802
Deposited On:02 Oct 2014 18:15
Last Modified:13 May 2016 18:43

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