Magneto-superconductivity of 100-atm O2-annealed RuSr2Gd1.5Ce0.5Cu2O10−δ

Abstract

is broadened under magnetic field with strong granularity like steps.

Resistivity study of RuSr2GdCu2O8 superconductor

“…All the samples can be indexed with tetragonal structure in P4/mmm space group using lattice parameters a = 3.838 (Å) and c = 11.55 (Å) 1, 13. As can be seen, no evident difference, except a small impurity peak of SrRuO 3 at 31.5° in samples RA0 and RA1 is observed in the XRD patterns.…”

Magneto-Superconductivity of Rutheno-Cuprates

“…3. The lattice parameters were determined from the diffraction data in the tetragonal space group I4/mmm: a = b = 3.8337(6) Å and c = 28.493(1) Å for the as-synthesized sample, and a = b = 3.8327(7) Å and c = 28.393(1) for the 100-atm O 2 -annealed sample [34]. The shorter lattice parameters for the 100-atm O 2 -annealed sample are believed to manifest the fact that it is more completely oxygenated than the as-synthesized sample.…”

“…This gets credence from the fact, that though Ln = Y sample unlike others contains small impurity of SrRuO 3 , the 150 K transition in fc is same for all the studied compounds. In widely studied Gd/Ru-1222 compound also the rise in FC magnetization is reported at around 160-180 K, and was associated with an antiferromagnetic transition of Ru spins [7,27,34]. We did couple of M vs H experiments for Ln = Ho sample at various temperatures of 130, 120, 110, 100 and 5 K, the results are shown in Fig.29 (a, b, c, d and e).…”

“…Furthermore, as already assumed based on the lattice parameters and the Tc values, the difference between the 100-atm and 1-atm O2-annealed samples is larger for the Ru-1222 phase than for the Ru-1212 phase, see also the data for relevant samples in Refs. [25,33,34]. In Table 1 As far as the HTHT treated various Ln/Ru-1212, 1222 or 1232 compounds are concerned their oxygen stoichiometry is believed to be very close to nominal, because nearly no change was observed in the weight of synthesized samples, indicating towards their fixed nominal oxygen content.…”

“…For reference, reported [34] χ vs. T plot for Gd/Ru-1222 is shown in inset of Fig.26. Interestingly for magnetic ordering temperature for Gd/Ru-1212 of ~133 K was also found to be relatively lower than for HPHT synthesized Y/Ru-1212 (~150 K) [12,16,18].…”