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

Research output: Contribution to journalArticle

9 Citations (Scopus)

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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Spin glass
Perovskite
spin glass
magnetic properties
Superconducting materials
perovskites
Ions
SQUIDs
perovskite
doped crystals
Temperature
Specific heat
Volume fraction
Magnetization
critical temperature
ions
tendencies
x rays
Electron microscopes
electron microscopes

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., ... 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

Magnetic and superconducting properties of doped and undoped double Perovskite Sr 2YRuO 6 . / Rao, S. M.; Srivastava, J. K.; Wu, M. K.; Mok, B. H.; Chen, C. L.; Ling, M. C.; Liu, Hsiang Lin; Chen, Y. Y.; Ho, J. C.

In: Journal of Superconductivity and Novel Magnetism, Vol. 24, No. 4, 01.05.2011, p. 1249-1262.

Research output: Contribution to journalArticle

Rao, S. M. ; Srivastava, J. K. ; Wu, M. K. ; Mok, B. H. ; Chen, C. L. ; Ling, M. C. ; Liu, Hsiang Lin ; Chen, Y. Y. ; Ho, J. C. / Magnetic and superconducting properties of doped and undoped double Perovskite Sr 2YRuO 6 In: Journal of Superconductivity and Novel Magnetism. 2011 ; Vol. 24, No. 4. pp. 1249-1262.
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AU - Chen, C. L.

AU - Ling, M. C.

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AU - Ho, J. C.

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N2 - 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

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