Magnetic and superconducting properties of doped and undoped double Perovskite Sr 2YRuO 6

S. M. Rao, J. K. Srivastava, M. K. Wu, B. H. Mok, C. L. Chen, M. C. Ling, Hsiang Lin Liu, Y. Y. Chen, J. C. Ho

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Abstract

We report here SQUID (magnetization) measurements, along with supporting specific heat, Raman, SEM (scanning electron microscope), EDX (energy dispersive X-ray) and XRD (X-ray diffraction) measurements, on Cu-doped and undoped double perovskite $\mathrm{Sr}-{2}^{2+}\mathrm{Y}^{3+}\mathrm{Ru}^{5+}\ mathrm{O}-{6}^{2-}$ (abbreviated as SrY2116) system grown as single crystal using high-temperature solution growth technique. These measurements show the undoped system to be a nonmetallic (insulating) spin glass (SG) and the ∼ 5-30% Cu-doped (i.e. Cu-concentration/(Cu∈+∈Ru-concentration) ∼ 5-30%) system to be a spin glass superconductor (SGSC) with T c (critical temperature) ∼ 28-31 K and superconducting volume fraction, f sc∼ 2.2-9%. To mention, similar measurements done on undoped and Cu-doped BaY2116 and BaPr2116 systems show for them the same (SG, SGSC) behaviors. However they show a decrease in T c and f sc when diamagnetic Y 3+ ions are replaced by Pr 3+ spins, presumably due to enhanced internal pair breaking, and also decreased Cu-O-Cu overlap, owing to Pr 3+ presence; these phenomena are known to exist in the Pr123 compound, PrBa 2Cu 3O 7-δ (δ∼ 0), due to ∼ 10% of Pr 3+ ions having tendency to occupy Ba 2+ sites. Measurements done on undoped and Cu-doped SrHo2116 show similar SG and SGSC properties. Further, the undoped and Cu-doped SrY2116 crystals grown by hydrothermal growth technique (i.e., grown using lower temperature and high pressure) show same behaviors. From these investigations it can be said that the undoped Ru-double perovskites (A 2BB′- O 6, B′=Ru) are SG systems and that Cu-doped Ru-double perovskites (A 2BB′-O δ, δ∼ 6, B′=Ru 1-x Cu x, 0<xâ‰0.3) are SG superconductors (SGSCs). Results are discussed.

Original languageEnglish
Pages (from-to)1249-1262
Number of pages14
JournalJournal of Superconductivity and Novel Magnetism
Volume24
Issue number4
DOIs
Publication statusPublished - 2011 May 1

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Keywords

  • Double perovskite
  • Frustration
  • High-T superconductivity
  • Magnetic superconductor
  • Ruthenocuprate
  • Spin glass

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Rao, S. M., Srivastava, J. K., Wu, M. K., Mok, B. H., Chen, C. L., Ling, M. C., Liu, H. L., Chen, Y. Y., & Ho, J. C. (2011). Magnetic and superconducting properties of doped and undoped double Perovskite Sr 2YRuO 6 Journal of Superconductivity and Novel Magnetism, 24(4), 1249-1262. https://doi.org/10.1007/s10948-010-0819-4