Magneto-resistance, thermal conductivity, thermo-electric power and specific heat of superconductor Gd0.95Pr0.05Ba2Cu2.94M0.06O7−δ (M=Fe, Ni, Zn and Mn)

Chakraborty, Tirthankar; Gahtori, Bhasker; Soni, Ajay; Okram, G. S.; Agrawal, S.; Chen, S.-Y.; Kuo, Y. K.; Ahsan, M. A. H.; Rao, Ashok

doi:10.1016/j.ssc.2011.05.029

Cited by 5 publications

(6 citation statements)

References 33 publications

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“…However, with co-doping we observe changes in lattice parameters. The XRD patterns of other rare-earth series are reported in our earlier communications [10,11]. Figure 2 shows the temperature dependence of figure of merit for pristine, Pr-doped as well as co-doped samples of Y0.95Pr0.05Ba2(Cu1-xMx)3O7-δ and it is seen that Z value for pristine sample of YBa2Cu3O7-δ (Y-123) remains almost constant for the temperature range 90<T<200 K. It may be mentioned that one can not estimate Z values below 90K because in this range of temperatures, σ tends to infinity and S tends to zero.…”

Section: Resultsmentioning

confidence: 94%

“…Oxygen rich samples in the present work were prepared using solid state reaction method [10]. The stoichiometric amount of the required constituent materials Y2O3 (or Gd2O3 or Dy2O3, BaCO3, CuO, Pr6O11 , Fe2O3, MnO, NiO, and ZnO) were ground well in agate mortar and calcined in air at 930 o C for 12 hours.…”

Section: Experimental Techniquesmentioning

confidence: 99%

“…Thermo-power and thermal conductivity measurements were performed simultaneously using direct pulse method. The experimental details of electrical and thermal measurements are described in our previous communications [9][10][11].…”

Section: Experimental Techniquesmentioning

confidence: 99%

“…We have modified the structure by doping at the rare earth as well as at Cu-site. The present communication is an outcome of our earlier thermal measurements done on pristine and transition metal co-doped compounds of RE0.95Pr0.05Ba2Cu3O7-δ with RE=Y, Gd and Eu [9][10][11]. The thermal conductivity and thermo-power measurements were carried out in the temperature range 10-300K in a closed cycle refrigerator using a direct pulse method.…”

Section: Introductionmentioning

confidence: 98%

“…They have shown that oxygen deficient samples show higher Z-values. However it is well-know that electrical conductivity, thermal conductivity and thermo-power strongly depend on nature of dopants and dopant concentration [8][9][10][11], thus, it would be interesting to explore other oxide superconductors where one can modify the stoichiometry and use suitable doping in order to achieve a fairly large value of Z.…”

Section: Introductionmentioning

confidence: 99%

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High Temperature Superconductors REBa2Cu3O7 (RE=Y, Gd and Eu) For Possible Thermo-electric Applications

Rao¹,

Geetha²,

Manjunath³

et al. 2015

Review of Applied Physics

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In this communication, we present some results on thermo-electric properties of various high temperature superconductors. We have performed measurements on three rare-earth based cuprate superconductors. All the superconductors were prepared using solid state reaction method. The XRD studies on the present samples indicate that all the samples are in single phase. We observe that among the rare-earths studied in the present work, Gd-123 has the highest value of Z. In fact around 200K, the Zvalue for GdBa2Cu3O7-δ (Gd-123) samples is about two times that of the other rare-earths like YBa2Cu3O7-δ and EuBa2Cu3O7-δ. However with Pr-doping at the rare-earth site, we get a different trend viz. the figure of merit for Eu0.95Pr0.05Ba2Cu3O7 (Eu-Pr5%) and Gd0.95Pr0.05Ba2Cu3O7 (Gd-Pr5%) samples is less than their respective pristine compounds. On contrary, an almost two-fold increase is seen in Y0.95Pr0.05Ba2Cu3O7(Y-Pr5%) sample compared to the pristine sample of this series.

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Section: Resultsmentioning

confidence: 94%

Section: Experimental Techniquesmentioning

confidence: 99%

Section: Experimental Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High Temperature Superconductors REBa2Cu3O7 (RE=Y, Gd and Eu) For Possible Thermo-electric Applications

Rao¹,

Geetha²,

Manjunath³

et al. 2015

Review of Applied Physics

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Grain alignment and its relationship with superconductivity and thermal transport of Ni-substituted Bi-2212 textured rods fabricated at two different growth rates

Ozabaci

Kızılaslan

Madre

et al. 2015

J Mater Sci: Mater Electron

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The microstructure, grain alignment, superconducting and thermal transport properties of Ni-substituted Bi-2212 rods grown at two different speeds (15 and 30 mm/h) through the Laser Floating Zone (LFZ) method, have been evaluated. Significant variations in grain size, grain alignment, electrical and thermoelectric power properties have been observed for the rods depending on the growth and substitution rates. The highest aligned structure was obtained on unsubstituted rods grown at 15 mm/h. Both increased substitution and growth rates degraded the grain alignment. The presence of Ni-based secondary phases showed that Ni is not totally incorporated into the crystal structure, which, in turn, caused a decrease on the average grain size of the rods. With increasing Ni concentration, peak values of thermoelectric power of the rods, which lie between 3.8 and 6.4 μVK-1 , monotonically decreased while thermal conductivity values did not show any systematic change. The activation energy of flux motion, U o , was calculated from the field dependent resistivitytemperature curves in a range of 0-8 T. Superconducting transition temperatures, T c onset and T c offset , and activation energy, U o , were found to decrease with increasing Ni contents and applied magnetic field. It has been estimated from the magnetic field dependence of activation energy of the samples that plastic creep of the collective vortices is dominant in the rods.

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Electrical and thermal transport properties of Dy0.95Pr0.05Ba2(Cu1−x Mx)3O7−δ with (M=Fe, Co, Ni and Zn) bulk superconductors

Geetha

Rao

Thukaram

et al. 2014

Solid State Communications

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Magneto-resistance, thermal conductivity, thermo-electric power and specific heat of superconductor Gd0.95Pr0.05Ba2Cu2.94M0.06O7−δ (M=Fe, Ni, Zn and Mn)

Cited by 5 publications

References 33 publications

High Temperature Superconductors REBa2Cu3O7 (RE=Y, Gd and Eu) For Possible Thermo-electric Applications

High Temperature Superconductors REBa2Cu3O7 (RE=Y, Gd and Eu) For Possible Thermo-electric Applications

Grain alignment and its relationship with superconductivity and thermal transport of Ni-substituted Bi-2212 textured rods fabricated at two different growth rates

Electrical and thermal transport properties of Dy0.95Pr0.05Ba2(Cu1−x Mx)3O7−δ with (M=Fe, Co, Ni and Zn) bulk superconductors

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