Carbon-substituted MgB2 single crystals

Abstract

Carbon-substituted MgB2 single crystals, Mg(B_1-xC_x)_2 of 0.3-1.0 mm size were grown for x=0.02-0.15 by a high-pressure technique. The doping dependence of lattice constants studied in a range of x=0.0-0.2 shows a monotonic decrease in a, while the c parameter remains almost invariant. Using X-ray diffraction and Auger electron spectroscopy, the solubility limit of C in MgB2 was estimated to be about 15(+/-)1%,which is substantially larger than that reported for the polycrystalline samples synthesized by encapsulation techniques. Measurements of temperature dependence of magnetization and resistivity showed a dramatic decrease in Tc with C-substitution, followed by complete suppression of superconductivity for x>0.125. Resistivity measurements in magnetic fields parallel and perpendicular to the basal plane of the crystals showed a nearly isotropic state in the heavily-doped crystals (x>0.1).

15 pages, 5 figures, 1 table; to be published in Physica C

References in corpus (9)

• Crystal Chemistry of Carbon-Substituted MgB2
• Growth, structure analysis and anisotropic superconducting properties of MgB2 single crystals
• Intralayer Carbon Substitution in the MgB2 Superconductor
• Electronic structure of superconducting MgB2 and related binary and ternary borides
• Carbon doping of superconducting magnesium diboride
• Carbon solubility and superconductivity in MgB2
• Effect of Carbon-Doping in Bulk Superconducting MgB2 Samples
• Dependence of the superconducting transition temperature of single- and polycrystalline MgB2 on hydrostatic pressure
• Crystal growth and characterization of MgB2: Relation between structure and superconducting properties

Cited by in corpus (36)

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• Limits of the upper critical field in dirty two-gap superconductors
• Carbon-substitution effect on the electronic properties of MgB${}_2$ single crystals
• Improved Hc2 in Bulk-Form Magnesium Diboride by Mechanical Alloying With Carbon
• Resonant and crossover phenomena in a multiband superconductor tuning the chemical potential near a band edge
• Properties of MgB2 thin films with carbon doping
• Strong enhancement of Jc in binary and alloyed in-situ MgB2 wires by a new approach: Cold high pressure densification
• The different development of the anisotropic upper critical field in MgB2 by aluminum and carbon doping
• Nanoscale grains, high irreversibility field, and large critical current density as a function of high energy ball milling time in C-doped magnesium diboride
• Sc substitution for Mg in MgB2: effects on Tc and Kohn anomaly
• The doping effect of multiwall carbon nanotube on MgB2/Fe superconductor wire
• Evidence for Single-gap Superconductivity in Mg(B_{1-x}C_x)_2 Single Crystals with x=0.132 from Point-Contact Spectroscopy
• Enhancement of the irreversibility field by carbon substitution in single crystal MgB${}_2$
• Carbon-substitution dependent multiple superconducting gap of MgB${}_2$: a "sub-meV" resolution photoemission study
• Strong magnetic pair breaking in Mn substituted MgB_2 single crystals
• Effect of damage by 2-MeV He ions on the normal and superconducting properties of magnesium diboride
• Enhancement of in-field Jc in MgB2/Fe wire using single and multi-walled nanotubes
• Correlation between doping induced disorder and superconducting properties in carbohydrate doped MgB2
• Effect of damage by 2-MeV He ions and annealing on Hc2 in MgB2 thin films
• High Field Performance of Nano-Diamond Doped MgB2 Superconductor
• Superconducting Properties of adipic acid doped Bulk MgB2 Superconductor
• Doping Effect and Flux Pinning Mechanism of Nano-SiC Additions in MgB2 Strands
• MgB2 single crystals substituted with Li and with Li-C: Structural and superconducting properties
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• Synthesis of Mg(B${}_{1-x}$C${}_x$)${}_2$ Powders
• Mn and Fe Impurities in MgB_{2}
• Formation of MgB2 at low temperatures by reaction of Mg with B6Si
• Hollow carbon spheres as an efficient dopant for enhancing critical current density of MgB2 based tapes
• Reaction method control of impurity scattering in C-doped MgB2, proving the role of defects besides C substitution level
• Nonmagnetic impurity effects in MgB${}_2$
• ${}^{11}$B NMR study of pure and lightly carbon doped MgB${}_2$ superconductors
• Influence of the carbon substitution on the critical current density and AC losses in MgB2 single crystals