Does the pelletization pressure modify the effective anisotropy of the grains in (Bi,Pb)2223 bulk system?

Electrical effective parameters of the grains and the Montgomery's method in $$\hbox {Bi}_{1.65}\hbox {Pb}_{0.35}\hbox {Sr}_2\hbox {Ca}_{2.5}\hbox {Cu}_{3.5}\hbox {O}_y$$ Bi 1.65 Pb

“…Here, c , ab and T are the out-of-plane resistivity, the in-plane resistivity and the temperature of the samples, respectively [7]. These recent results for superconducting polycrystalline samples, show that high pelletization pressures affect not only the intergranular, but also the intragranular transport properties by increasing the density of defects and reducing the effective anisotropy of the grains [7].…”

“…Recently, electric transport properties were studied in (Bi,Pb)2223 polycrystalline samples that were cut from the upper or lower surfaces of cylindrical pellet [7]. Under these conditions, it was possible to determine the effective 1 3 anisotropy at sample level, = z ∕ x , which resulted to be ( ≥ 18) [7].…”

“…Recently, electric transport properties were studied in (Bi,Pb)2223 polycrystalline samples that were cut from the upper or lower surfaces of cylindrical pellet [7]. Under these conditions, it was possible to determine the effective 1 3 anisotropy at sample level, = z ∕ x , which resulted to be ( ≥ 18) [7]. Afterwards, by using an effective medium approximation model applied to electric transport measurements of the polycrystals [7,8], the effective anisotropy of the grains [7], t = c ∕ ab , their orientation probability, xa , the weak links resistivity, wl , and the slope of the temperature dependence of the grains' resistivity, A ab = ab ∕ T were determined.…”

“…Under these conditions, it was possible to determine the effective 1 3 anisotropy at sample level, = z ∕ x , which resulted to be ( ≥ 18) [7]. Afterwards, by using an effective medium approximation model applied to electric transport measurements of the polycrystals [7,8], the effective anisotropy of the grains [7], t = c ∕ ab , their orientation probability, xa , the weak links resistivity, wl , and the slope of the temperature dependence of the grains' resistivity, A ab = ab ∕ T were determined. Here, c , ab and T are the out-of-plane resistivity, the in-plane resistivity and the temperature of the samples, respectively [7].…”

“…Afterwards, by using an effective medium approximation model applied to electric transport measurements of the polycrystals [7,8], the effective anisotropy of the grains [7], t = c ∕ ab , their orientation probability, xa , the weak links resistivity, wl , and the slope of the temperature dependence of the grains' resistivity, A ab = ab ∕ T were determined. Here, c , ab and T are the out-of-plane resistivity, the in-plane resistivity and the temperature of the samples, respectively [7]. These recent results for superconducting polycrystalline samples, show that high pelletization pressures affect not only the intergranular, but also the intragranular transport properties by increasing the density of defects and reducing the effective anisotropy of the grains [7].…”