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

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

“…The intergranular critical temperature of the TlRe lm is almost 7 K lower than for intragranular ones. In comparison to the critical temperatures of the HgRe sample is several degrees higher than in rhenium free Hg samples [17].…”

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].…”

“…Among the thallium-based compounds the thin films of single TlO layer materials (Tl-1223) are superior because of their higher T c (0) and J c [107]. Thin films of Tl-1223 superconductors have critical current density in the range of 10 5 -10 6 A/cm 2 at 77K (both in field cooled and zero field cooled samples) depending upon the deposition technique adopted [47,66,84,[107][108][109].…”

“…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]. In Figure 12, a comparison of the magnetic field dependence of J c (77K) of Tl-1223 and Tl-2212 is shown.…”

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.…”