Relationship between superconductivity and crystal structure in NbB 2+x

H. Takagiwa, E. Nishibori, N. Okada, M. Takata, M. Sakata, Jun Akimitsu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We have performed magnetic susceptibility measurements and precise crystal structure analysis of the nonstoichiometric NbB2+x superconductor to reveal the relationship between Tc and crystal structure. From magnetic susceptibility measurements, it was found that Tc increases from 2.2 to 5.8 K with x. The crystal structures including both chemical compositions and lattice constants were precisely determined by Rietveld refinement using synchrotron X-ray powder diffraction data with three different wavelengths. We found that interatomic Nb-B distance increases with T c. The charge density of NbB2+x was revealed by the maximum entropy method based on Rietveld refinement. We find the difference in the number of electrons in the Nb site and B layer for NbB2+xwith different compositions and Tc.

Original languageEnglish
Pages (from-to)22-25
Number of pages4
JournalScience and Technology of Advanced Materials
Volume7
Issue number1 SPEC. ISS.
DOIs
Publication statusPublished - Jan 2006
Externally publishedYes

Fingerprint

Superconductivity
Rietveld refinement
Crystal structure
Magnetic susceptibility
Maximum entropy methods
Charge density
Chemical analysis
Synchrotrons
X ray powder diffraction
Superconducting materials
Lattice constants
Wavelength
Electrons

Keywords

  • Maximum Entropy Method (MEM)
  • NbB
  • Superconductivity

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Relationship between superconductivity and crystal structure in NbB 2+x . / Takagiwa, H.; Nishibori, E.; Okada, N.; Takata, M.; Sakata, M.; Akimitsu, Jun.

In: Science and Technology of Advanced Materials, Vol. 7, No. 1 SPEC. ISS., 01.2006, p. 22-25.

Research output: Contribution to journalArticle

Takagiwa, H. ; Nishibori, E. ; Okada, N. ; Takata, M. ; Sakata, M. ; Akimitsu, Jun. / Relationship between superconductivity and crystal structure in NbB 2+x . In: Science and Technology of Advanced Materials. 2006 ; Vol. 7, No. 1 SPEC. ISS. pp. 22-25.
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