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Кузманн, Э.; Mair, M.; Klencsár, Z.; Homonnay, Z.; Vértes, A.; Gritzner, G.

doi:10.1023/a:1006797417970

Cited by 8 publications

(8 citation statements)

References 6 publications

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“…Kuzmann et al [3] and Guo et al [16] suggested possible Fe substitution in the Mg site in the MgB 2 lattice [3]. Because these techniques were applied to an entire sample the claim of Fe substitution for Mg was inconclusive.…”

Section: Discussionmentioning

confidence: 99%

“…However, it had the least negative effect on J c -H behavior of all the elements they studied, including Cu, Ag, Y, Ti, and Mo. From their results using Mossbauer spectroscopy and XRD, Kuzmann et al suggested that Fe substitutes into the Mg site in the MgB 2 lattice, resulting in modest depression in T c [3]. These authors did not study the effect of Fe doping on J c (H).…”

Section: Introductionmentioning

confidence: 97%

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The effect of nanoscale Fe doping on the superconducting properties of MgB₂

Dou

Soltanian

Zhao

et al. 2005

Supercond. Sci. Technol.

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Iron is an important sheath material for fabrication of MgB 2 wires. However, the effect of Fe doping on the superconducting properties of MgB 2 remains controversial. In this work, we present results of nanoscale Fe particle doping in to MgB 2 . The Fe doping experiments were performed using both bulk and thin film form. It was found that Fe doping did not affect the lattice parameters of MgB 2 , as evidenced by the lack of change in the XRD peak positions for MgB 2 . Because of the high reactivity of nano-scale Fe particles, Fe doping is largely in the form of FeB at low doping level while Fe 2 B was detected at 10wt% doping by both XRD and TEM. There is no evidence for Fe substitution for Mg. The transition temperature decreased modestly with increasing Fe doping levels. The J c (H) performance was severely depressed at above 3wt% doping level. The detrimental effect of nano-scale Fe doping on both T c and J c (H) is attributable to the grain decoupling as a result of magnetic scattering of Fe-containing dopants at grain boundaries.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

The effect of nanoscale Fe doping on the superconducting properties of MgB₂

Dou

Soltanian

Zhao

et al. 2005

Supercond. Sci. Technol.

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“…(7) (Tl 0. results show that the approach through the model of resistance of the Josephson weak links [5] could be used to describe the properties of the intergranular weak links of thallium bulk samples which have plate-like grains of 15−20 µm long [9]. On the contrary, intergranular properties of the thin film samples are different because they obey relation (6) with different values of exponents than 2/3. At zero applied magnetic field the temperature width of transition is connected with superconducting strength distribution of the weak links.…”

Section: Tablementioning

confidence: 98%

Effect of Magnetic Field on Resistive Transition of Thin Film Thallium Based Superconductors

et al. 2004

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The temperature and magnetic field dependences of a.c.resistance of c-axis oriented (Tl0.5Pb0.5)(Sr0.8Ba0.2)2Ca2Cu3Ox and (Tl 0.6 Pb 0.24 Bi 0.16 )(Sr 0.9 Ba 0.1 ) 2 Ca 2 Cu 3 O x thin films as well as of (Tl0.5Pb0.5)(Sr0.8Ba0.2)2Ca2Cu3Ox bulk sample from 77 K to room temperature and in magnetic fields from zero to 3000 Oe were measured and analyzed. The magnetic field and temperature dependence of the resistive superconducting transition and irreversibility field were discussed both in the flux-creep model and in the superconducting liquid vortex state model. The temperature width of resistive transition was explained taking advantage of the Ambegaokar and Halperin model of the resistance of superconducting Josephson weak links and barrier of vortex motion presented by Tinkham. The irreversibility field was described by an exponential formula.

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“…1-8 Doping with different metals, 9,10 variation of stoichiometry, 11 and nonsuperconducting phase precipitation 12 are recent examples of the chemical tuning of superconducting materials. 14 Alternative synthetic routes 13,15 and postsynthesis treatments, 16 fabrication of dense wires, 17 pellets, 16 and tapes, 18 annealing in Mg vapor, 19 doping with Na, 20 Co, Fe, 21 Cu, or Ag, 10 introduction of SiC nanoparticles, 22 Ag powder, 23 Ti precipitates, 24 synthesis of MgB 2 /Mg nanocomposites, 25 intralayer carbon substitution 11,26 have all been reported. 1, 6,13 Various techniques to control pinning properties of MgB 2 have been suggested.…”

Section: Kenneth S Suslickmentioning

confidence: 99%