In: Physica C: Superconductivity and its Applications, 2015, vol. 509, p. 49–55
In the present work, polycrystalline samples with compositions MgB₂ + 3wt% GO + x wt% C₆H₈O₇ (x = 0, 5 and 10) have been synthesized to study the effect of combined addition of graphene oxide (GO) and citric acid (C₆H₈O₇) on superconducting properties of MgB₂. X-ray diffraction studies show the formation of hexagonal crystal structure of MgB₂ with space...
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In: physica status solidi (a), 2014, p. -
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In: Superconductor Science and Technology, 2013, vol. 26, no. 9, p. 095008
In the present paper we report the effect of graphene oxide (GO) doping on the structural and superconducting properties of MgB₂. Bulk polycrystalline samples have been synthesized via a solid state reaction route with compositions MgB₂ + x wt% of GO (x = 0, 1, 2, 3, 5, 7 and 10) by sintering at ~850 ° C in a reducing atmosphere of Ar/H₂ (9:1). The x-ray diffraction...
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In: Physical Review B - Condensed Matter and Materials Physics, 2012, vol. 86, no. 14, p. 144112
Using muon spin rotation (μSR) we investigated the magnetic and superconducting properties of a series of Ba(Fe1−xCox)₂As₂ single crystals with 0≤x≤0.15. Our study details how the antiferromagnetic order is suppressed upon Co substitution and how it coexists with superconductivity. In the nonsuperconducting samples at 0
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In: Physical Review B - Condensed matter and materials physics, 2012, vol. 85, no. 21, p. 214503
Using muon spin rotation and infrared spectroscopy, we investigated the recently discovered superconductor K0.73Fe1.67Se₂ with Tc≈32 K. We show that the combined data can be consistently described in terms of a macroscopically phase-segregated state with a matrix of ∼88% volume fraction that is insulating and strongly magnetic and inclusions with an ∼12%...
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In: Journal of Applied Physics, 2012, vol. 111, no. 7, p. E119
In the present work, we have studied the effect of Fe composition on the superconducting properties, such as transition temperature (Tc), upper critical field (Hc2), and irreversibility field (Hirr) of FeSe1/2Te1/2. The polycrystalline samples have been prepared via solid state reaction...
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In: Superconductor Science and Technology, 2010, vol. 23, no. 4, p. 045005
Carbon (C) and rare earth oxide (REO) co-doped bulk polycrystalline MgB₂ samples with nominal compositions Mg1 − y(REO)y(B0.95C0.05)₂ (where y = 0.00, 0.01, 0.03, 0.05 and REO = Eu₂O₃ or Pr₆O₁₁) have been synthesized via a solid state reaction route. The XRD results reveal the presence of impurity phases EuB₆ in...
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In: Superconductor Science and Technology, 2009, vol. 22, no. 12, p. 125014
In this paper we report the effect of carbon doping on the structural and superconducting properties of MgB₂ using citric and oxalic acids as carbon sources. The bulk polycrystalline samples have been synthesized via a standard solid state reaction route with composition MgB₂+x wt% of citric and oxalic acids (x = 0, 5 and 10). The x-ray diffraction results reveal the formation...
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In: Physica Status Solidi (a), 2009///doi-10.1002/pssa.200925180
In this paper we report the effect of Pr6O11 doping on the structural and superconducting properties of MgB2. The bulk samples of Pr6O11-doped MgB2 have been prepared with nominal compositions Mg1-x(Pr6O11)x/6B2 (where x = 0.0, 0.01, 0.02, 0.03, 0.04, and 0.05) via a standard solid-state reaction route by sintering in a reducing atmosphere of Ar/H2. The superconducting transition temperature Tc...
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In: New Journal of Physics, 2009, vol. 11, p. 055050
We present a muon spin rotation (μSR) study of the magnetic and superconducting properties of single crystals of electron-doped BaFe2−xCoxAs₂ with x = 0.08, 0.20 and 0.25 (Tc = 9, 25 and 20 K) and of polycrystalline hole-doped Pr1−xSrxFeAsO with x = 0 and 0.2 (Tc = 15...
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