The effect of annealing time in oxygen flux on the electric properties of the Ru(Sr2−xCax)GdCu2O8±z system with 0.0&lt;x&lt;2.0, prepared at ambient pressure

Abatal, Mohamed; Chavira, E.; Filippini, C.; Garcı́a-Vázquez, Valentı́n; Pérez, J. C.; Tholence, J.L.; Noël, H.

doi:10.1016/j.physc.2005.04.026

Cited by 2 publications

(3 citation statements)

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“…The sample RA2 shows a hint of onset of superconductivity around 25 K while sample RB2 shows no hint of superconductivity until 13 K. The resistivity behaviour of these samples is similar to that observed by Abtal et al 19 and Matsubara et al 29. There is a small kink in the resistivity at around 134 K of both the samples, this anomaly is attributed to the reduction of spin scattering, where a conduction electron scatters by exchanging spin with magnetic moment or spin excitation 19. To explore this kink we have plotted the derivative of the resistivity versus temperature curve, which shows a peak maximum at about 134 K in both the samples inset of Fig.…”

Section: Resultssupporting

confidence: 92%

“…A long tail of the d ρ /d T appears at the high‐temperature side crosses zero around 50 K, which may mark the thermodynamics T c . The derivative plot in magnetic transition region clearly show as a pronounced peak with maxima at T M = 136 K. This is anomaly attributed to the reduction of spin scattering, where a conduction electron scatters by exchanging spin with magnetic moment or spin excitation 19.…”

Section: Resultsmentioning

confidence: 97%

“…The sample annealed for 120 h in air is non‐superconducting and their resistivity behaviour is similar to that as observed in Refs. 19, 29. The non‐superconducting sample has the larger c axis and the unit cell volume than that of the superconducting sample of Ru‐1212.…”

Section: Discussionmentioning

confidence: 99%

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Resistivity study of RuSr₂GdCu₂O₈ superconductor

Mohan

Singh

Kaur

et al. 2010

Physica Status Solidi (a)

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The results of Point Contact Andreev Reflection Spectroscopy on polycrystalline RuSr2GdCu2O8 pellets are presented. The wide variety of the measured spectra are all explained in terms of a modified BTK model considering a d-wave symmetry of the superconducting order parameter. Remarkably low values of the energy gap ∆ = (2.8 ± 0.2)meV and of the 2∆/kBTc ≃ 2 ratio are inferred. From the temperature evolution of the dI/dV vs V characteristics we extract a sublinear temperature dependence of the superconducting energy gap. The magnetic field dependence of the conductance spectra at low temperatures is also reported. From the ∆ vs H evolution, a critical magnetic field Hc 2 ≃ 30T is inferred. To properly explain the curves showing gap-like features at higher voltages, we consider the formation of a Josephson junction in series with the Point Contact junction, as a consequence of the granularity of the sample.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 97%