Effect of Ce Substitution on the Magnetoresistivity and Flux Pinning Energy of the Bi2Sr2Ca1−x Ce x Cu2O8+δ Superconductors

Abstract

In this study, the effect of Ce doping on the properties of Bi 2 Sr 2 Ca 1−x Ce x Cu 2 O 8+δ ceramic superconductors, with x = 0.0, 0.01, 0.05, 0.1, and 0.25, has been investigated.Samples' precursors were prepared using the conventional solid state method and subsequently textured using the Laser Floating Zone technique. The magnetoresistance measurements were studied under various applied magnetic fields. The activation energies, irreversibility fields (H irr ), upper critical fields (H c2 ) and coherence lengths at 0 K (ξ(0)) were calculated from the resistivity versus temperature (ρ-T ) curves, under DC magnetic fields up to 5 T. The thermally activated flux flow model has been applied in order to calculate the flux pinning energies. The results indicated that H c2 (0) varied from 416.19 to 115 T and the flux pinning energies varied from 1.46 to 0.042 eV at 0 T.

Improvement of superconducting properties in Na-doped BSCCO superconductor

“…Bi(CH 3 COO) 3 (≥99.99%, Aldrich), Sr(CH 3 COO) 2 •0.5H 2 O (99%, Panreac), Ca(CH 3 COO) 2 •2H 2 O (98%, Alfa Aesar), Cu(CH 3 COO) 2 •H 2 O (98%, Panreac) and Na(CH 3 COO) (99%, Alfa Aesar) commercial powders were used as starting materials. They were weighed in stoichiometric amounts and dissolved in a mixture of glacial acetic acid (CH 3 COOH) (Panreac PA) and distilled water.…”

“…Since the discovery of Bi-based high-temperature superconductors [1], which are among the most promising materials for technological and industrial applications, many experimental studies have been performed [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] in order to improve their critical temperature (Tc), critical current density (Jc), and better understand the structural properties of the system. The BSCCO families can be described by the Bi 2 Sr 2 Ca n-1 Cu n O 2n+4+y general formula, where n=1, 2 and 3.…”

Magnetoresistivity studies for BiPb-2223 phase added by BaSnO3 nanoparticles

“…TAFC was first pointed out by Anderson [14], at which creep involves bundles of flux lines hopping over the pinning barriers due to the thermal activation although Lorentz force exerted on the flux bundle by the current is smaller than the pinning force. Several researchers have pointed out that the TAFC model is the best model for describing the electrical resistivity broadening data under applied magnetic field for various phases of Bi-based superconductors [20][21][22][23][24][25][26][27][28]. Ambegaokar and Halperin's theory is another approach to study the flux line motion under applied magnetic field [29].…”

Effect of Yttrium substitution on superconductivity in Bi-2212 textured rods prepared by a LFZ technique

“…The n value indicates the number of CuO 2 layers in the crystal structure, producing the Bi-2201, Bi-2212 and Bi-2223 phases with critical temperatures, Tc's, of about 20, 85, and 110 K, respectively [1,2]. Since their discovery, many experiments have been performed to better understand their structural and physical properties of the system, and to improve their critical temperature (Tc) and critical current density (Jc) [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. After these works, it is well-known that the Bi-2212 phase is the most stable and easy to prepare among the high-Tc phases.…”

“…Among these methods, it is possible to distinguish between solid state texturing, as the hot-pressing technique [23,24], and directional solidification from the melt, as the laser floating zone (LFZ) or the electrically assisted laser floating zone (EALFZ) [25,26]. Among these methods, the LFZ has been shown as very effective to produce a good grain orientation in Bi-2212 superconductors [3,5,6,14,27]. This method is characterized for producing very high thermal gradients in the solidification front, leading to a preferential alignment of grains with their c-axis perpendicular to the growth direction [28] and, as a consequence, maximizing the transport properties along the growth axis.…”