Evidence for Possible Phase-Separations in RuSr2(Gd,Ce)2Cu2O10-delta

Details Evidence for Possible Phase-Separations in RuSr2(Gd,Ce)2Cu2O10-delta Evidence for Possible Phase-Separations in RuSr2(Gd,Ce)2Cu2O10-delta

2001-09-26

arxiv.org/abs/cond-mat/0109500v1

Physics

Condensed Matter

Superconductivity

8 pages, 3 figures, submitted to Phys. Rev. B, "Rapid Communications" (September 26, 2001)

Scientific paper

10.1103/PhysRevB.65.020511

An unusual thermal-magnetic hysteresis was observed between a minor magnetic transition around 120 K and the main one at 80 K in superconducting RuSr2(R,Ce)2Cu2O10-delta (Ru1222R) samples, where R = Gd or Eu, down to a submicron length-scale. The observation suggests a possible phase-separation and is consistent with the very small but universal demagnetizing factor observed, which is difficult to reconcile with the canted spin-structure previously proposed. In such a scenario, the unusual superconducting properties of the Ru-based cuprates can also be understood naturally.

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