Melt texturing and thermomechanical processing of (Bi,Pb)-1212 superconductors

Epitaxial growth and superconducting anisotropy ofPbSr2Y1−xCaKomori1, Inaba2, Kaneko3 et al. 2014Phys. Rev. B4120View full textAdd to dashboardCite

“…2(b). For y > 0.20, the films include Bi2212 as a sec- x = 0.29 (1) 0.33 (2) 0.37 (3) 0 50 100 150 200 250 300 y = 0.17 (4) 0.12 (5) 0.00 (3) 0.48 (Bi2212) 0 50 100 150 200 250 300 y = 0.17 (4) 0.12 (5) 0.00 (3) 0.48 (Bi2212) 0 50 100 150 200 250 300 y = 0.17 (4) 0.12 (5) 0.00 (3) 0.48 (Bi2212) 0 50 100 150 200 250 300 (b) y = 0.17 (4) 0.12 (5) 0.00 (3) 0.48 (Bi2212) ondary phase and exhibit distinctly different properties than the single-phase films. The resistivity decreases with increasing Bi concentration and even without the quenching treatment, a sharp superconducting transition takes place at 80 K. Also, the XRD peaks of the Bi2212 phase become more intense.…”

“…The crystal structure of PbSr 2 CaCu 2 O 7+δ (Pb1212) is very similar to that of TlBa 2 CaCu 2 O 7−δ (Tl1212) and HgBa 2 CaCu 2 O 6+δ (Hg1212), both of which have a critical temperature T c greater than 100 K. Pb1212 is expected to be less anisotropic than Tl1212 and Hg1212 because the ionic radius of the element account for the block layers is the smallest in the series (r Hg ≈ r Tl > r Pb ). Among the Pb1212 compounds, Pb 1−y Bi y Sr 2 Y 1−x Ca x Cu 2 O 7+δ (PbBi1212) [1][2][3][4] and Pb 1−y Cu y Sr 2 Y 1−x Ca x Cu 2 O 7+δ (PbCu1212) [5,6] are of specific importance for industry because they mainly consist of the ubiquitous elements Pb and Ca rather than the more exotic Bi and Y, which are currently used for high-T c superconducting wires. However, for Pb1212, the superconducting properties such as anisotropy and critical current are inadequately understood because of the difficulty of obtaining single-crystal samples of this material.…”

Wilson coefficients for Higgs boson production and decoupling relations to $$ \mathcal{O}\left({\alpha}_s^4\right) $$

“…In fact, a naive renormalization with (Z O 1 ) 2 leads to uncanceled poles as has already been observed in Refs. [43,44]. A careful analysis of the renormalization of the product of two operators O 1 has been performed in Ref.…”

Epitaxial growth and superconducting anisotropy of PbSr$_{2}$Y$_{1-x}$Ca$_{x}$Cu$_{2}$O$_{7+δ}$ thin films

“…The resistivity decreases with increasing Bi concentration and even without the quenching treatment, a sharp superconducting transition takes place at 80 K. Also, the XRD peaks of the Bi2212 phase become more intense. Therefore, we conclude that the superconducting transition observed for y > 0.20 is 0.33 (2) 0.37 0.33 (2) 0.37 0.33 (2) 0.37 0.12 (5) 0.00 (3) 0.48 (Bi2212) 0 50 100 150 200 250 300 (b) y = 0.17 (4) 0.12 (5) 0.00 (3) 0.48 (Bi2212) 0 50 100 150 200 250 300 (b) y = 0.17 (4) 0.12 (5) 0.00 (3) 0.48 (Bi2212) 0 50 100 150 200 250 300 (b) y = 0.17 (4) 0.12 (5) 0.00 (3) 0.48 (Bi2212) FIG. 2: Temperature dependence of resistivity and Hall coefficients for samples with different Ca and Bi concentrations.…”