Conductivity fluctuation and superconducting parameters of the YBa2Cu3−x(PO4)xO7–δ material

Sarmiento, M. P. Rojas; Uribe-Laverde, M. A.; López, Enrique Vera; Téllez, D.A. Landı́nez; Roa-Rojas, J.

doi:10.1016/j.physb.2007.04.042

Cited by 60 publications

(12 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…From this crossover, very important physical parameters can be calculated according to the Ginzburg-Landau (GL) theory [38]. From the Ginzburg number which limits the validity of the Ginzburg-Landau (GL) theory,…”

Section: Resultsmentioning

confidence: 99%

Excess Conductivity Study in Nano-CoFe2O4-Added YBa2Cu3O7−d and Y3Ba5Cu8O18±x Superconductors

Slimani

Hannachi

Salem

et al. 2015

J Supercond Nov Magn

View full text Add to dashboard Cite

We report electrical conductivity fluctuation analyses on YBa 2 Cu 3 O 7−d (noted Y-123) and Y 3 Ba 5 Cu 8 O 18±x (noted Y-358) polycrystalline samples added with nano-sized ferrite cobalt (CoFe 2 O 4 ) particles. Phases and microstructure have been systematically investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD results reveal that the lattice parameters change for both Y-123 and Y-358 phases. SEM observations show that the grain size is reduced with increasing the content of CoFe 2 O 4 in the yttrium-based superconductor (YBCO) matrix The temperature dependence of electrical resistivity ρ(T ) has been measured and the effect of addition of magnetic CoFe 2 O 4 in the paraconductivity region has been reported. The thermodynamic fluctuation is obtained by analyzing the excess of conductivity on the basis of the Aslamazov-Larkin theory. The coherence length, the effective layer thickness, critical magnetic fields, and critical current density are estimated. Superconducting parameters are affected by the nanoparticle addition, and results are discussed in relevance to the structural and microstructure differences between Y-123 and Y-358.

show abstract

Section: Resultsmentioning

confidence: 99%

Excess Conductivity Study in Nano-CoFe2O4-Added YBa2Cu3O7−d and Y3Ba5Cu8O18±x Superconductors

Slimani

Hannachi

Salem

et al. 2015

J Supercond Nov Magn

View full text Add to dashboard Cite

show abstract

“…The temperature T G and the Ginzburg number N G in the transition region are determined from the intersection of critical regime and 3D conductivity regime. By employing the T G and N G equations and using the Ginzburg-Landau theory [18][19][20], important superconducting parameters are calculated by using the equations:…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Inter-plane Coupling and Superconductivity in Cu0.5Tl0.5Ba2(Ca3−yM y )Cu4O12−δ (M = 0, Pr, Y, Er, Gd; y = 0.02) Samples

Khan

Ashraf

Safeer

2016

J Supercond Nov Magn

View full text Add to dashboard Cite

Cu 0.5 Tl 0.5 Ba 2 (Ca 3−y M y )Cu 4 O 12−δ (M=0, Pr, Y, Er, Gd; y=0.02) samples are synthesized at normal pressure to see the effect of M +3 elements doping in enhancing the inter-plane coupling of Cu 0.5 Tl 0.5 Ba 2 (Ca 3−y M y )Cu 4 O 12−δ superconductors. These samples have shown the tetragonal crystal structure in which the axis lengths increase with doping of rare-earth impurities. In the resistivity measurements, these samples have shown metallic variations of resistivity from room temperature down to the onset of superconductivity. The onset of superconductivity, the zero resistivity critical temperature, and the magnitude of diamagnetism are suppressed with the doping of rare-earth impurities at Ca sites. The excess conductivity analysis has shown suppression in the onset temperature of 3D and 2D Lawrence-Doniach (LD) conductivity regimes. The coherence length along the c-axis (ξ c(0) ), the inter-layer coupling (J ), and the Fermi velocity (V F ) of the carriers are suppressed with Y doping, whereas the values of these parameters increase with the doping of Er and Gd. However, the values of B c0 (T ), B c1 (T ), and J c (0) are suppressed with the doping of Y, Er, and Gd. Moreover, the values of magnetic field penetration depth (λ pd ) and the Ginzburg-Landau (GL) parameter κ increase with the doping of rare-earth elements. Since the λ pd is related inversely to the density of mobile carriers in the conducting CuO 2 planes, the increase in values of these parameters indicates that the density of mobile carriers is suppressed in the conducting planes with the doping of rare-earth elements. These studies stress the pivotal role of mobile charge carriers in the mechanism of high-T c superconductivity and have shown that M +3 rareearth elements develop some localization of the carriers in their neighborhood, thereby suppressing the values of essential superconductivity parameters.Keywords Cu 0.5 Tl 0.5 Ba 2 (Ca 3−y M y )Cu 4 O 12−δ (M = 0, Pr, Y, Er, Gd, y = 0.02) superconductors · Decoupling of CuO 2 planes · Enhanced flux pinning · Longer coherence length

show abstract

“…Daripada peralihan ini, parameter fizikal yang penting boleh dikira menggunakan teori Ginzburg-Landau (GL) (Han & Rapp 1995). Medan magnet genting termodinamik B c (0) boleh didapati menggunakan nombor Ginzburg N G melalui persamaan (Aly et al 2010;Sarmiento et al 2007…”

Section: Pengenalanunclassified

Analisis Kekonduksian Lebihan Superkonduktor YBa2Cu3O7-δ Ditambah Nanozarah PbO

Al-Sharabi¹,

Tajuddin²,

Saffiey³

et al. 2016

JSM

View full text Add to dashboard Cite

Conductivity fluctuation and superconducting parameters of the YBa2Cu3−x(PO4)xO7–δ material

Cited by 60 publications

References 11 publications

Excess Conductivity Study in Nano-CoFe2O4-Added YBa2Cu3O7−d and Y3Ba5Cu8O18±x Superconductors

Excess Conductivity Study in Nano-CoFe2O4-Added YBa2Cu3O7−d and Y3Ba5Cu8O18±x Superconductors

Enhancement of Inter-plane Coupling and Superconductivity in Cu0.5Tl0.5Ba2(Ca3−yM y )Cu4O12−δ (M = 0, Pr, Y, Er, Gd; y = 0.02) Samples

Analisis Kekonduksian Lebihan Superkonduktor YBa2Cu3O7-δ Ditambah Nanozarah PbO

Contact Info

Product

Resources

About