Carbon-substituted MgB2 single crystals

Carbon-substituted MgB2 single crystals, Mg(B1-xCx)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...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2003-10, Vol.397 (1-2), p.7-13
Main Authors: Lee, Sergey, Masui, Takahiko, Yamamoto, Ayako, Uchiyama, Hiroshi, Tajima, Setsuko
Format: Article
Language:English
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Summary:Carbon-substituted MgB2 single crystals, Mg(B1-xCx)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 plus/minus 1%, which is substantially larger than that reported for the polycrystalline samples synthesized by encapsulation techniques. Measurements of the 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).
ISSN:0921-4534
DOI:10.1016/S0921-4534(03)01296-6