Carbon-substituted MgB2 single crystals

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

Research output: Contribution to journalArticle

200 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
Externally publishedYes

Fingerprint

Carbon
Single crystals
Crystals
electrical resistivity
carbon
single crystals
Auger electron spectroscopy
Superconductivity
Encapsulation
doped crystals
Auger spectroscopy
Lattice constants
electron spectroscopy
Magnetization
Substitution reactions
superconductivity
solubility
Solubility
Doping (additives)
retarding

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

Cite this

Carbon-substituted MgB2 single crystals. / Lee, Sergey; Masui, Takahiko; Yamamoto, Ayako; Uchiyama, Hiroshi; Tajima, Setsuko.

In: Physica C: Superconductivity and its Applications, Vol. 397, No. 1-2, 01.10.2003, p. 7-13.

Research output: Contribution to journalArticle

Lee, Sergey ; Masui, Takahiko ; Yamamoto, Ayako ; Uchiyama, Hiroshi ; Tajima, Setsuko. / Carbon-substituted MgB2 single crystals. In: Physica C: Superconductivity and its Applications. 2003 ; Vol. 397, No. 1-2. pp. 7-13.
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