Carbon-substituted MgB2 single crystals

Sergey Lee, Takahiko Masui, Ayako Yamamoto, Hiroshi Uchiyama, Setsuko Tajima

研究成果: Article査読

215 被引用数 (Scopus)

抄録

Carbon-substituted MgB2 single crystals, Mg(B 1-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±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).

本文言語English
ページ(範囲)7-13
ページ数7
ジャーナルPhysica C: Superconductivity and its applications
397
1-2
DOI
出版ステータスPublished - 2003 10月 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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