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 language | English |
|---|---|
| Pages (from-to) | 1249-1262 |
| Number of pages | 14 |
| Journal | Journal of Superconductivity and Novel Magnetism |
| Volume | 24 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 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
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 journal › Article
}
TY - JOUR
T1 - Magnetic and superconducting properties of doped and undoped double Perovskite Sr 2YRuO 6
AU - Rao, S. M.
AU - Srivastava, J. K.
AU - Wu, M. K.
AU - Mok, B. H.
AU - Chen, C. L.
AU - Ling, M. C.
AU - Liu, Hsiang Lin
AU - Chen, Y. Y.
AU - Ho, J. C.
PY - 2011/5/1
Y1 - 2011/5/1
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
AB - 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
KW - Double perovskite
KW - Frustration
KW - High-T superconductivity
KW - Magnetic superconductor
KW - Ruthenocuprate
KW - Spin glass
UR - http://www.scopus.com/inward/record.url?scp=79957446868&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79957446868&partnerID=8YFLogxK
U2 - 10.1007/s10948-010-0819-4
DO - 10.1007/s10948-010-0819-4
M3 - Article
AN - SCOPUS:79957446868
VL - 24
SP - 1249
EP - 1262
JO - Journal of Superconductivity and Novel Magnetism
JF - Journal of Superconductivity and Novel Magnetism
SN - 1557-1939
IS - 4
ER -