Carbon-substituted MgB2 single crystals

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

Research output: Contribution to journalArticle

206 Citations (Scopus)

Abstract

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).

Original languageEnglish
Pages (from-to)7-13
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume397
Issue number1-2
DOIs
Publication statusPublished - 2003 Oct 1

Keywords

  • Carbon substitution
  • Magnesium diboride
  • Magnetic and transport properties
  • Single crystals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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