Pinning energy and irreversibility line in superconducting GdSr2RuCu2O8

Attanasio, C.; Salvato, M.; Ciancio, Regina; Gombos, M.; Pace, S.; Uthayakumar, S.; Vecchione, A.

doi:10.1016/j.physc.2004.07.004

Cited by 29 publications

(21 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Regarding the resistively measured transition a characteristic feature of Josephson networks is that, while the transition strongly broadens with increasing magnetic field the onset of the superconducting transition (given by the temperature where the grains become superconducting) shifts only slightly. This effect has been seen in transport experiments both on Ru-1212 and Ru-1222 [79,80,81,82]. A similar broadening occurs also in susceptibility measurements.…”

Section: Superconducting Propertiessupporting

confidence: 73%

The ruthenocuprates: natural superconductor–ferromagnet multilayers

Nachtrab

Bernhard

Lin

et al. 2006

Comptes Rendus. Physique

View full text Add to dashboard Cite

The recently discovered ruthenocuprates have attracted great interest because of the microscopic coexistence of superconducting and ferromagnetic order. Typically, these materials become magnetically ordered at temperatures around 125-145 K and superconductivity sets in between 15 and 50 K. While superconductivity arises in the CuO2 layers the RuO2 layers in between order magnetically. In this paper we summarize some of the crystallographic, magnetic and superconducting properties of the ruthenocuprates, as obtained from investigations on polycrystalline samples as well as single crystals. RésuméDécouverts récemment, les ruthenocuprates ont suscité un intérêténormeà cause de la coexistence d'un ordre supraconducteur et ferromagnétique. Dans ces matériaux, la phase magnétique apparaît autour de 125-145 K et la phase supraconductrice entre 15 et 50 K. Les couches de CuO2 sont supraconductrices et ce sont les couches interstitielles de RuO2 qui sont ordonnées magnétiquement. Dans cet article nous résumons quelques-unes des propriétés cristallographiques, magnétiques et supraductrices des ruthenocuprates déduites desétudes sur deś echantillons polycristallins ainsi que sur des monocristaux.

show abstract

Section: Superconducting Propertiessupporting

confidence: 73%

The ruthenocuprates: natural superconductor–ferromagnet multilayers

Nachtrab

Bernhard

Lin

et al. 2006

Comptes Rendus. Physique

View full text Add to dashboard Cite

show abstract

“…Indeed R = ρl/4a 2 , where ρ = 0.4mΩ cm is the low temperatures resistivity and l ≈ 1000Å, as estimated in Ref. 11 . In our case, we have found that the typical contact size varied between 300Å and 1000Å.…”

Section: Pcar Spectroscopy On Rusr2gdcu2o8: Experiments and Theomentioning

confidence: 66%

Pairing state in the ruthenocuprate superconductorRuSr2GdCu2O8: A point-contact Andreev reflection sp

et al. 2006

View full text Add to dashboard Cite

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.

show abstract

“…3). R(T) and measurements, discussed in [4], show a wide resistive transition with an onset at completing at in correspondence with the Meissner state transition onset. However, superconductivity of these samples ap- pears to be highly affected by the presence of magnetic fields with dramatically decreasing even for very low field intensities.…”

Section: Samples Characterisationmentioning

confidence: 81%

“…Anyway, the real nature of the magnetic order has been long debated, due to the controversial indication given by experiments. In fact, whereas neutron diffraction spectroscopy [3] and magnetic susceptibility measurements [4] pointed toward anti-ferromagnetism, muon spin rotation [2] and low frequency transport measurements [5] pointed toward ferromagnetism. The hypothesis, up to now, that better agrees with experiments is the compromise solution of canted anti-ferromagnetism [6] that combines features of both orderings.…”

Section: Introductionmentioning

confidence: 99%

Morphological and Structural Study on<tex>$rm GdSr_2rm RuCu_2rm O_8$</tex>Melt-Textured Samples

Ciancio

Gombos

Vecchione

et al. 2005

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

Strongly anisotropic magnetic and superconducting properties have been recently observed to coexist in Gd1212 (GdSr 2 RuCu 2 O 8 ). Magnetic ordering appears to be due to Ru planes while Cu planes are correlated to the superconducting properties. The unavailability of single crystals makes relevant the fabrication of oriented samples of macroscopic size by melt texturing techniques. Then we have grown MTG samples starting from 1 cm diameter pellets. Gd1210 (GdSr 2 RuO 6 ) is added, analogously to Y211 in YBCO MTG processes. Preliminary studies have been performed on Gd1212 powders to explore the range of temperatures and the reactions involved. XRD analysis shows that a certain degree of orientation is present in our samples. By Polarized Light Optical Microscopy we have observed large oriented domains of almost millimeter size. Larger domains are expected by optimization of growth parameters. Images show even a homogeneous distribution of Gd1210 precipitates with a mean size of a few micrometers. SEM and EDS analyses have also been performed, confirming optical observations. Resistivity measurements show a 12 K wide superconductive transition with onset at about 40 K. Optimization of successive annealing treatments are expected to reduce this width.

show abstract

Pinning energy and irreversibility line in superconducting GdSr2RuCu2O8

Cited by 29 publications

References 49 publications

The ruthenocuprates: natural superconductor–ferromagnet multilayers

The ruthenocuprates: natural superconductor–ferromagnet multilayers

Pairing state in the ruthenocuprate superconductorRuSr2GdCu2O8: A point-contact Andreev reflection sp

Morphological and Structural Study on<tex>$rm GdSr_2rm RuCu_2rm O_8$</tex>Melt-Textured Samples

Contact Info

Product

Resources

About

Pinning energy and irreversibility line in superconducting GdSr2RuCu2O8

Cited by 29 publications

References 49 publications

The ruthenocuprates: natural superconductor–ferromagnet multilayers

The ruthenocuprates: natural superconductor–ferromagnet multilayers

Pairing state in the ruthenocuprate superconductorRuSr2GdCu2O8: A point-contact Andreev reflection sp

Morphological and Structural Study on&lt;tex&gt;$rm GdSr_2rm RuCu_2rm O_8$&lt;/tex&gt;Melt-Textured Samples

Contact Info

Product

Resources

About

Morphological and Structural Study on<tex>$rm GdSr_2rm RuCu_2rm O_8$</tex>Melt-Textured Samples