RT Journal Article
T1 Cathodoluminescence microscopy of superconducting and non-superconducting Tl_2Ba_2CuO_(6+ δ) polycrystals
A1 Díaz-Guerra Viejo, Carlos
A1 Piqueras De Noriega, Francisco Javier
A1 Opagiste, C.
AB 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.
PB Elsevier Science BV
SN 0921-4534
YR 1996
FD 1996-03-01
LK https://hdl.handle.net/20.500.14352/59237
UL https://hdl.handle.net/20.500.14352/59237
LA eng
NO © 1996 Elsevier Science B.V.CDG acknowledges MEC for a FPI research grant. This work has been supported by DGICYT (Project PB93-1256).
NO DGICYT
NO MEC
DS Docta Complutense
RD 20 mar 2026