Excess electrical conductivity and thermoelectric power of (YBa2Cu3.05Ox)Agn pellets

Dey, Tusharkanti; Radha, K.; Barik, H. K.; Bhattacharya, Debasis; Chopra, K. L.

doi:10.1016/0038-1098(90)90999-r

Cited by 29 publications

(6 citation statements)

References 18 publications

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“…[17][18][19][20][21] However, for the highly c-axis oriented epitaxial thin films, Oh et al 22 reported the 2D-3D crossover. For polycrystalline bulk systems, most analyses are consistent with the characteristics of 3D thermal fluctuations.…”

Section: ͑1͒mentioning

confidence: 99%

Excess-conductivity analysis of Mg- and Be-doped polycrystalline Cu0.5Tl0.5Ba2Ca1.5M1.5Cu4O12−δ (M=, Be, Mg) superconductors

Hassan

Shabbir

Khan

2009

Journal of Applied Physics

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Articles you may be interested inExcess conductivity analysis and infrared absorption spectroscopy of Mg-doped TlBa2Ca2Cu3O10-δ superconductor Low Temp.High-resolution electrical resistivity ͑T͒ data of as-prepared and O 2 -annealed Cu 0.5 Tl 0.5 Ba 2 Ca 1.5 M 1.5 Cu 4 O 12−␦ ͑M = 0, Be, Mg͒ superconductor samples have been taken for investigating critically the superconducting fluctuations. Using the Aslamazov-Larkin ͑AL͒ and Lawrence-Doniach ͑LD͒ models of excess conductivity, several physical parameters of the models have been estimated. In all the as-prepared and oxygen postannealed samples one crossover temperature and two distinct exponents have been observed. The excess conductivity data of the as-prepared as well as O 2 -annealed undoped sample seem to fit well two-dimensional ͑2D͒, three-dimensional ͑3D͒ AL equations, but for Mg-and Be-doped and their respective oxygen annealed samples do not seem to fit well with 2DAL and 3DAL equations with one distinct crossover temperature. We observed two more critical regions: −4.86Ͻ ln͑͒ Ͻ −3.76 and −4.76 Ͻ ln͑͒ Ͻ −1.63 in the Mg-and Be-doped Cu 0.5 Tl 0.5 Ba 2 Ca 1.5 M 1.5 Cu 4 O 12-␦ ͑M = 0, Be, Mg͒ samples, giving exponents of Ϫ0.37 and Ϫ0.79, respectively. The interlayer coupling strength J is found to increase with increased Mg or Be content and oxygen postannealing. The critical temperatures ͑T c ͒ varies from 99 to 116 K and the transition widths ͑⌬T c ͒, estimated from dp / dT͑T͒ plots by using the full width at half maximum of the peaks, come out to be lying between 1.91 and 6.28 K for all samples, indicating a sharp transition.

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Section: ͑1͒mentioning

confidence: 99%

Excess-conductivity analysis of Mg- and Be-doped polycrystalline Cu0.5Tl0.5Ba2Ca1.5M1.5Cu4O12−δ (M=, Be, Mg) superconductors

Hassan

Shabbir

Khan

2009

Journal of Applied Physics

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“…A number of studies on the excess conductivities for Y-123 systems have been done by using various fitting schemes. For polycrystalline bulk systems, most analyses are consistent with the characteristics of three-dimensional thermal fluctuations [8][9][10][11][12]. However, for the highly c-axis-oriented epitaxial thin films, Oh et al [13] reported the 2D-3D cross-over.…”

Section: Introductionmentioning

confidence: 77%

Fluctuation-induced conductivity of five planar Cu0.5Tl0.5Ba2Ca4−xMgxCu5O14−δ (x=1,2) superconductors

Irfan

Hassan

Khan

2009

Physica C: Superconductivity

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“…The estimated values of ξ c (0) from magnetoconductivity analysis are given in table 3. They are quite small compared to that of YBa 2 Cu 3 O 7 materials [9][10][11][12][13]. The coherence length along the ab-plane ξ ab (0) was estimated from the fitted values of P 1 and by taking into account the effective magnetic field.…”

Section: Magneto-conductivitymentioning

confidence: 99%

“…The excess conductivity analysis in high-T c superconductors has been carried out by several groups. YBa 2 Cu 3 O 7 superconductors exhibit a crossover from 2D to 3D fluctuations in the mean-field regime [9][10][11][12][13]. Two-dimensional fluctuations are widely reported in both Bi-Sr-Ca-Cu-O [14][15][16][17] and Tl-Ba-Ca-Cu-O superconductors [18,19].…”

Section: Introductionmentioning

confidence: 99%

Excess conductivity and magneto-conductivity studies in pure and Ag-doped (La_1−xY_x)₂Ba₂CaCu₅O_zsuperconductors

Nayak

Ravi

2006

Supercond. Sci. Technol.

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The temperature variations of electrical resistivity have been measured on pure and 5 wt% Ag-doped (La 1−x Y x ) 2 Ba 2 CaCu 5 O z superconductors in the absence and presence of 1 T magnetic field. The electrical resistivity data in the absence of magnetic field were analysed in terms of fluctuation-induced excess conductivity in the mean-field regime by using the Aslamazov-Larkin (AL), Lawrence-Doniach (LD) and Maki-Thompson (MT) models. The fluctuations in the amplitude of order parameter are found to be two dimensional in nature. The magneto-resistivity data were analysed in terms of fluctuation magneto-conductivity by using the AL and MT models for layered superconductors and by taking into account both orbital and Zeeman terms. These materials exhibit a strong pair breaking effect and the typical phase breaking time at 100 K is found to be of the order of 10 −16 s. The typical values of coherence lengths along the ab-plane and along the c-direction at 0 K are found to be 28.5 and 0.4 Å.

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Excess electrical conductivity and thermoelectric power of (YBa2Cu3.05Ox)Agn pellets

Cited by 29 publications

References 18 publications

Excess-conductivity analysis of Mg- and Be-doped polycrystalline Cu0.5Tl0.5Ba2Ca1.5M1.5Cu4O12−δ (M=, Be, Mg) superconductors

Excess-conductivity analysis of Mg- and Be-doped polycrystalline Cu0.5Tl0.5Ba2Ca1.5M1.5Cu4O12−δ (M=, Be, Mg) superconductors

Fluctuation-induced conductivity of five planar Cu0.5Tl0.5Ba2Ca4−xMgxCu5O14−δ (x=1,2) superconductors

Excess conductivity and magneto-conductivity studies in pure and Ag-doped (La_1−xY_x)₂Ba₂CaCu₅O_zsuperconductors

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Excess electrical conductivity and thermoelectric power of (YBa2Cu3.05Ox)Agn pellets

Cited by 29 publications

References 18 publications

Excess-conductivity analysis of Mg- and Be-doped polycrystalline Cu0.5Tl0.5Ba2Ca1.5M1.5Cu4O12−δ (M=, Be, Mg) superconductors

Excess-conductivity analysis of Mg- and Be-doped polycrystalline Cu0.5Tl0.5Ba2Ca1.5M1.5Cu4O12−δ (M=, Be, Mg) superconductors

Fluctuation-induced conductivity of five planar Cu0.5Tl0.5Ba2Ca4−xMgxCu5O14−δ (x=1,2) superconductors

Excess conductivity and magneto-conductivity studies in pure and Ag-doped (La1−xYx)2Ba2CaCu5Ozsuperconductors

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Excess conductivity and magneto-conductivity studies in pure and Ag-doped (La_1−xY_x)₂Ba₂CaCu₅O_zsuperconductors