Preparation of Tl-2212 and -1223 superconductor thin films and their microwave properties

Magnetization, Susceptibility and Critical Currents of (Tl2-xRex)Ba2CaCu2OyThin Films

“…Before the deposition of the precursor lms, the 60 nm thick CeO 2 buer layer was deposited on the top of (845) R-plane sapphire substrates using RF magnetron sputtering [12,13] [16]. The prepared powders were ne (diameter of the grains 0.10.3 µm) and did not contain carbonates.…”

A Search for a Low Anisotropic Superconductor

“…These superconducting compounds are more promising because of their lower anisotropy, higher T c (0), higher critical current densities and irreversibility field H irr as compared to their counterparts in double Tl-O layer superconductors family [47][48][49][50][51][52][53][54][55]. The TlSr 2 CaCu 2 O 7 (Tl-1212) is the parent compound in single Tl-O layer superconductors showing no signs of superconductivity down to liquid helium temperature because it grows in the over-doped state [56].…”

“…The CuO 2 planes are found to be more favorable for superconductivity as compared to insulating charge reservoir block containing single or double Tl-O layers [110]. The superconducting properties like critical temperature, irreversibility field, critical current density and flux pinning in thallium-based compounds largely depend on the thickness of the insulating Tl-O layer and the strength of Josephson coupling between CuO 2 planes [23,49,50,53,[111][112][113][114][115]. The presence of the Tl-O layers between the CuO 2 superconducting blocks yields anisotropy in the physical properties of these compounds.…”

“…The interlayer coupling can also affect the critical current density of these superconductors. The Tl-1223 superconductors have been found to have higher J c as compared to Tl-2212 and Tl-2223 compounds [47,49,50]. The Tl-1223 superconductors are very useful in electronic devices fabrication because the critical currents in these compounds decreases slowly as compared to double Tl-O layer compounds in the presence of external magnetic fields [47,55].…”

Excess conductivity analysis and infrared absorption spectroscopy of Mg-doped TlBa2Ca2Cu3O10-δ superconductor

“…These compounds can be generally represented by Tl-22(n − 1)n, where "n" represents the number of CuO 2 planes. On the other hand, the monolayer Tl-based system includes TlBa 2 [6][7][8][9][10][11][12][13][14]. The single Tl-O layer compounds have primitive tetragonal structure.…”