Effects of Co and Mn doping on the structure and superconductivity of

Shi, Lei; Zhang, Shangming; Zhang, Huarong

doi:10.1016/j.ssc.2008.04.028

Cited by 20 publications

(10 citation statements)

References 27 publications

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“…For this reason, research activities are ongoing to find other potential options for enhancing the flux pinning strength of MgB 2 like for example dual doping on both B and Mg sites. Except for the case of Al that can be substituted for Mg up to at least 40% [12][13][14][15], doping on the Mg sites is usually limited to few atomic percent or even less [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Among the transition metal elements, only few results have been published on the possibility of substituting platinum group metal elements in MgB 2 .…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterisation of Os doped MgB 2

Grivel

Namazkar

Alexiou

et al. 2014

Physica C: Superconductivity and its Applications

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Section: Introductionmentioning

confidence: 99%

Preparation and characterisation of Os doped MgB 2

Grivel

Namazkar

Alexiou

et al. 2014

Physica C: Superconductivity and its Applications

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“…Beside boron site doping, numerous attempts have been made at doping various elements on the Mg sites. Unfortunately, while Al can replace up to 40 at.% Mg [18][19][20][21], for other elements solubility is limited to a few percent in most cases [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] and is often below detection limit [41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Influence of iridium doping in MgB2 superconducting wires

Grivel

2018

Physica C: Superconductivity and its Applications

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Document Version Peer reviewed versionLink back to DTU Orbit Citation (APA): Grivel, J-C. (2018). Influence of iridium doping in MgB2 superconducting wires. Physica C: Superconductivity and its Applications, 547, 7-15. https://doi. Highlights MgB 2 wires doped with Ir (iridium) were prepared and reacted in Ar.  The solubility limit of Ir in the MgB 2 lattice is not larger than 1.5 at.% relative to Mg.  The critical current density is degraded in the Ir-doped samples. AbstractMgB 2 wires with iridium doping were manufactured using the in-situ technique in a composite Cu-Nb sheath. Reaction was performed at 700°C, 800°C or 900°C for 1h in argon atmosphere. A maximum of about 1.5 at.% Ir replaces Mg in MgB 2. The superconducting transition temperature is slightly lowered by Ir doping. The formation of IrMg 3 and IrMg 4 secondary phase particles is evidenced, especially for a nominal stoichiometry with 2.0 at.% Ir doping. The critical current density and accommodation field of the wires are strongly dependent on the Ir content and are generally weakened in the presence of Ir, although the effect is less pronounced at lower temperatures.

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“…Some work has been reported on Mn-doping at the planar Cu site in Nd 1.85 Ce 0.15 Cu 1Àx Mn x O 4 , YBa 2 Cu 3 O 7 , LaSrCuO x , and Bi 2 Sr 2 Ca 2 Cu 3 O x systems. [5][6][7][8][9][10][11][12][13][14] In these reports it was observed that a structural transition from orthorhombic to tetragonal phase occurs with increasing content of Mn atoms. 5 It was also observed that the remnant magnetic moments of doped Mn enhances the antiferromagnetic alignment of spins of Cu-atoms which suppress the superconductivity of the final compound.…”

Section: Introductionmentioning

confidence: 99%

“…10 From the reported work it was clear that the aaxis length decreases slightly while the c-axis length decreases rapidly as Mn content is increased in the sample. 13,14 Our motivation is to study the effect of Mn on the inter-planer correlation of the carriers and their influence on the superconductivity of Cu 0.5 Tl 0.5 Ba 2 (Ca 2Ày Mn y )Cu 3 O 10Àd compound. We have tried to investigate these effects by fluctuation induced conductivity analysis on the conductivity data of Cu 0.5 Tl 0.5 Ba 2 (Ca 2Ày Mn y )Cu 3 O 10Àd (y ¼ 0,0.15,0.25,0.35,0.5) samples.…”

Section: Introductionmentioning

confidence: 99%

Suppressed 3D conductivity in Mn doped Cu0.5Tl0.5Ba2Ca2−yMnyCu3O10−δ superconductors

Quratulain

Khan

2013

Journal of Applied Physics

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We have synthesised Mn-doped Cu0.5Tl0.5Ba2(Ca2−yMny)Cu3O10−δ superconducting samples and studied their Fluctuation Induced Conductivity (FIC) analysis. The Tc(R = 0) and magnitude of diamagnetism are suppressed with increased Mn-doping in the final compound. FIC analyses have shown a suppression of 3D Lawrence and Doniach (LD) regime and a significant enhancement of 2D LD regime of Mn-doping of y = 0.35. In the sample with Mn-doping of y = 0.5, the 3D LD regime vanishes altogether and only 2D LD regime is observed, showing the confinement of superconductivity in the two dimensional planes. The coherence length along the c-axis and the Fermi velocity of the carriers are suppressed with increased Mn doping. Using the Ginzburg-Landau (GL) number [NG] and GL equations, the thermodynamic critical magnetic field Bc(0), the lower critical field Bc1(0), the upper critical field Bc2(0), the critical current density Jc(0), and penetration depth λp.d are determined. The values of critical fields Bc(0) and Bc1(0) increases, despite suppression in the Tc(R = 0) with increased Mn-doping. The values of Jc(0), the penetration depth Λp.d, and inter-layer coupling are suppressed with enhanced Mn-doping. These observations suggested that Mn ions act as sub-nano-scale pinning centers between the CuO2 planes and their presence at the Ca-sites promote the de-coupling of CuO2 planes.

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Effects of Co and Mn doping on the structure and superconductivity of

Cited by 20 publications

References 27 publications

Preparation and characterisation of Os doped MgB 2

Preparation and characterisation of Os doped MgB 2

Influence of iridium doping in MgB2 superconducting wires

Suppressed 3D conductivity in Mn doped Cu0.5Tl0.5Ba2Ca2−yMnyCu3O10−δ superconductors

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