Detailed Physical Characterizations of Cu-rich and Ru-poor (Ru0.9Cu0.1)Sr2YCu2O7.9

Balamurugan, S.

doi:10.1007/s10948-010-0782-0

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…So far these perovskite materials have been obtained by different methods viz., solid-state classical ceramic reaction route, high-pressure and high temperature (HPHT) route, solid state synthesis by different precursor sources, electrochemical oxidation and soft-chemistry routes [5,11,12,15,25]. Our previous investigations on the perovskite cobalt oxide materials have brought many interesting and exciting innovative results [25][26][27][28][29][30][31][32][33]. Thus an extensive work on these perovskite cobalt oxide materials is warranted for further study.…”

Section: Introductionmentioning

confidence: 99%

Syntheses and Magnetic-Properties of Zn-Diluted Sr-Based Perovskite Cobalt Oxides, Sr1−x Zn x CoO3; 0.05≤x≤0.3

Balamurugan

2012

J Supercond Nov Magn

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In order to check the solubility of Zn in the (Sr 1−x Zn x )CoO 3 perovskite structure and their research findings, several polycrystalline samples have been prepared under wide extreme synthesis conditions at 6 GPa/1300-1650°C. While 0.05 ≤ x ≤ 0.3 compositions revealed single phased cubic structure materials, x > 0.3 showed multiphased materials for (Sr 1−x Zn x )CoO 3 system. Like other substituted perovskite cobalt oxide systems (Ca, Y, Ho and Ce), the transport properties of the present materials show rather sizable changes with respect to 'x', although there are insignificant variations in lattice parameter and in Curie temperature, T c . All the present samples show soft ferromagnetism with T c in the range of 272-285 K for 0.05 ≤ x ≤ 0.3. The effective paramagnetic moment, P eff determined from the paramagnetic region decreases upon the substitution of Zn for Sr-site. These P eff (3.3-2.8 µ B /Co) values for 0.05 ≤ x ≤ 0.3 compositions seem to suggest that the Co 4+ lie in intermediate spin (IS) state for the present (Sr 1−x Zn x )CoO 3 series, although they are slightly smaller than those expected for IS-Co 4+ ; P eff = 3.87 µ B /Co. The electrical resistivity is found to increase with increase of 'x' for the investigated samples. The temperature and field dependence of both positive and negative magnetoresistance (MR) are noted for the Zn substituted samples. About 5% of -MR is observed for x = 0.05 sample around the transition temperature (280 K) under the field strength difference, H = 90 kOe. The present research findings are compared with our previous results on different perovskite cobalt oxides.

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Section: Introductionmentioning

confidence: 99%

Syntheses and Magnetic-Properties of Zn-Diluted Sr-Based Perovskite Cobalt Oxides, Sr1−x Zn x CoO3; 0.05≤x≤0.3

Balamurugan

2012

J Supercond Nov Magn

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Impact of Tuning Molar Ratio in the Starting Materials: Magneto-Transport Features of Hybrid YSr2Ru0.9Cu2.1O7.9

Balamurugan

2010

J Supercond Nov Magn

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IMPACT OF Ce DOPING ON THE MAGNETIC AND TRANSPORT PROPERTIES OF Y_1-xCe_xSr₂Ru_0.9Cu_2.1O_7.9; x = 0.05 AND 0.1

Balamurugan

2012

Int. J. Mod. Phys. B

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The magnetic and transport properties of lightly Ce doped, Y 1-x Ce x Sr 2 Ru 0.9 Cu 2.1 O 7.9(x = 0.05 and 0.1) samples have been studied and their results are compared with the pristine rutheno-cuprate, YSr 2 Ru 0.9 Cu 2.1 O 7.9. The electron doping due to Ce 4+ for Y 3+ ion impacts on the physical properties of the present system. The tetragonal stabilized samples exhibit magneto superconducting properties under zero field cooled condition (H = 10 Oe ) and the diamagnetic onset transition, Td shift slightly towards higher temperature with the increase of "x". Weak antiferromagnetic like hysteresis curves are seen for these samples at 2 K in the magnetic field strength up to ±10 kOe and the magnetization moment, M(μB/ Ru ) decreases with increase of "x". While the magnetic property of the present system is due to canted Ru moments, the superconducting signal originates from CuO 2 plane. Through electrical resistivity measurements we observe that none of the samples exhibit bulk superconductivity down to 2 K. However the x = 0.05 sample reveals lowest resistivity in the entire temperature range than x = 0 and 0.1 samples. The isothermal magnetoresistance, MR(H) measured at different temperatures vary with tuning of "x". While x = 0.1 doped sample shows lower -MR(~ 8%), the pristine sample exhibits maximum -MR(45%) at 2 K under ±90 kOe field condition.

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Detailed Physical Characterizations of Cu-rich and Ru-poor (Ru0.9Cu0.1)Sr2YCu2O7.9

Cited by 3 publications

References 24 publications

Syntheses and Magnetic-Properties of Zn-Diluted Sr-Based Perovskite Cobalt Oxides, Sr1−x Zn x CoO3; 0.05≤x≤0.3

Syntheses and Magnetic-Properties of Zn-Diluted Sr-Based Perovskite Cobalt Oxides, Sr1−x Zn x CoO3; 0.05≤x≤0.3

Impact of Tuning Molar Ratio in the Starting Materials: Magneto-Transport Features of Hybrid YSr2Ru0.9Cu2.1O7.9

IMPACT OF Ce DOPING ON THE MAGNETIC AND TRANSPORT PROPERTIES OF Y_1-xCe_xSr₂Ru_0.9Cu_2.1O_7.9; x = 0.05 AND 0.1

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Detailed Physical Characterizations of Cu-rich and Ru-poor (Ru0.9Cu0.1)Sr2YCu2O7.9

Cited by 3 publications

References 24 publications

Syntheses and Magnetic-Properties of Zn-Diluted Sr-Based Perovskite Cobalt Oxides, Sr1−x Zn x CoO3; 0.05≤x≤0.3

Syntheses and Magnetic-Properties of Zn-Diluted Sr-Based Perovskite Cobalt Oxides, Sr1−x Zn x CoO3; 0.05≤x≤0.3

Impact of Tuning Molar Ratio in the Starting Materials: Magneto-Transport Features of Hybrid YSr2Ru0.9Cu2.1O7.9

IMPACT OF Ce DOPING ON THE MAGNETIC AND TRANSPORT PROPERTIES OF Y1-xCexSr2Ru0.9Cu2.1O7.9; x = 0.05 AND 0.1

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IMPACT OF Ce DOPING ON THE MAGNETIC AND TRANSPORT PROPERTIES OF Y_1-xCe_xSr₂Ru_0.9Cu_2.1O_7.9; x = 0.05 AND 0.1