Effects of carbon doping on superconductivity in magnesium diboride

W. Mickelson; John Cumings; W. Q. Han; A. Zettl

doi:10.1103/PhysRevB.65.052505

← Back to search

Effects of carbon doping on superconductivity in magnesium diboride

W. Mickelson, John Cumings, W. Q. Han, A. Zettl

DOI 10.1103/PhysRevB.65.052505 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We introduce carbon onto boron sites in MgB2. The resulting changes in crystal lattice constants and superconducting transition temperature Tc are characterized by x-ray-diffraction, magnetic susceptibility, and electrical resistance measurements. The consequence of approximately 10% carbon doping of boron sites is a 1% contraction of the intraplane lattice dimension (with no appreciable change in the interplane dimension) and a lowering of Tc by approximately 7 K. The relative contributions to the shift in Tc from lattice contraction and charge transfer are evaluated.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown
MgB1.8C0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	Pressure not reported	midpoint
MgB1.8C0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	Pressure not reported	unknown
Al0.1Mg0.9B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	37	Pressure not reported	unknown