Magneto-transport characterization of Dy123 monodomain superconductors

̧ekała, M. P; Mucha, J.; Vanderbemden, Philippe; Cloots, Rudi; Ausloos, Marcel

doi:10.1007/s00339-004-3014-2

Cited by 5 publications

(5 citation statements)

References 34 publications

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“…The modeled data are shown to agree nicely with the experiment [ figure 6(a)]. Note that the temperature difference is related directly to the thermal conductivity κ of melt-textured YBCO, for which experimental data available in the literature span a relatively large range, from ~ 0.7 W/m K to ~ 20 W/m K and is anisotropic [55][56][57][58][59]. In the present case, we take anisotropy into account and assume κ(||ab) = 11 W/m K and κ(||c) = 3 W/m K. The results of the model reproduce qualitatively the behaviour shown in the experiment: (i) an initial increase of the sample temperature nearing the vicinity of the sample corner (r = a, z = b), and (ii) a very small temperature gradient across the sample surface, although the amplitude of the applied AC field (34 mT) is smaller than the full-penetration field at 77 K (~ 124 mT).…”

Section: Temperature Distribution During Self-heating -Experiments Andsupporting

confidence: 70%

“…The modelled data are shown to agree nicely with the experiment (figure 6(a)). Note that the temperature difference is related directly to the thermal conductivity κ of melt-textured YBCO, for which the experimental data available in the literature span a relatively large range, from ∼0.7 W m −1 K −1 to ∼20 W m −1 K −1 and are anisotropic [55][56][57][58][59]. In the present case, we take anisotropy into account and assume κ ab = 11 W m −1 K −1 and κ c = 3 W m −1 K −1 .…”

Section: Temperature Distribution During Self-heating-experiments And...mentioning

confidence: 99%

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Self-heating of bulk high temperature superconductors of finite height subjected to a large alternating magnetic field

Laurent¹,

Fagnard²,

Babu³

et al. 2010

Supercond. Sci. Technol.

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Abstract. In this work we study, both experimentally and numerically, the self-heating of a bulk, large YBCO pellet of aspect ratio (thickness / diameter) ~ 0.4 subjected to a large AC magnetic field. To ensure accurate temperature measurements, the sample was placed in an experimental vacuum chamber to achieve a small and reproducible heat transfer coefficient between the superconductor and the cryogenic fluid. The temperature was measured at several locations on the sample surface during the self-heating process. The experimentally determined temperature gradients are found to be very small in this arrangement (< 0.2 K across the radius of the superconductor). The time-dependence of the average temperature T(t) is found to agree well with a theoretical prediction based on the one-dimensional (1-D) Bean model, assuming a uniform temperature in the sample. A 2-D magneto-thermal model was also used to determine the space and time-dependent temperature distribution T (r, z, t) during the application of the AC field. The losses in the bulk pellet were determined using an algorithm based on the numerical method of Brandt, which was combined with a heat diffusion algorithm implemented using a finite-difference method. The model is shown to be able to reproduce the main trends of the observed temperature evolution of the bulk sample during a self-heating process. Finally, the 2-D model is used to study the effect of a non-uniform distribution of critical current density J c (r, z) on the losses within the bulk superconductor.

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Section: Temperature Distribution During Self-heating -Experiments Andsupporting

confidence: 70%

Section: Temperature Distribution During Self-heating-experiments And...mentioning

confidence: 99%

Self-heating of bulk high temperature superconductors of finite height subjected to a large alternating magnetic field

Laurent¹,

Fagnard²,

Babu³

et al. 2010

Supercond. Sci. Technol.

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“…In addition, the temperature dependence of the thermal conductivity of small bar-shaped samples was measured using a home-made experimental set-up inserted in a Quantum Design Physical Property Measurement System (PPMS) [20], [21]. Fig.…”

Section: Methodsmentioning

confidence: 99%

Measurements of Thermal Effects in a Bulk YBCO Single Domain Superconductor Submitted to a Variable Magnetic Field

Laurent

Vanderbemden

Meslin

et al. 2007

IEEE Trans. Appl. Supercond.

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Abstract-When YBCO single domains are subjected to a variable magnetic field, the motion of vortices may give rise to a significant temperature increase and a degradation of the superconducting properties. We have experimentally investigated such effects in bulk melt-processed YBCO single domains. Several temperature sensors, a pick-up coil and two Hall probes were placed against the surface of a monolithic bulk YBCO pellet. Data were simultaneously recorded during the application of ac magnetic fields of various amplitudes, either with or without a pre-existing dc trapped flux. The measurement results agree well with to those obtained by numerical modeling. It was also found that a superimposed dc magnetic moment reduces the temperature increase caused by the ac magnetic field.Index Terms-High-temperature superconductors, magnetic variables measurement, thermal variables measurement.

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“…Pekala et al [6] have reported Z value of about 2×10 -5 per K for textured samples of DyBa2Cu3O7-δ. Gonzalez et al [7] have investigated Z parameter for EuBa2Cu3O7-δ and have demonstrated that Z strongly depends on the oxygen content (7-δ).…”

Section: Introductionmentioning

confidence: 98%

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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Magneto-transport characterization of Dy123 monodomain superconductors

Cited by 5 publications

References 34 publications

Self-heating of bulk high temperature superconductors of finite height subjected to a large alternating magnetic field

Self-heating of bulk high temperature superconductors of finite height subjected to a large alternating magnetic field

Measurements of Thermal Effects in a Bulk YBCO Single Domain Superconductor Submitted to a Variable Magnetic Field

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

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