Electronic and crystal structures of organic superconductors under the uniaxial strain

S. Kagoshima, R. Kondo, M. Maesato

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The interrelation between the electronic properties and the crystal structure was studied in the two-dimensional organic superconductor α-(BEDT-TTF)2NH4Hg(SCN)4 under the uniaxial strain. For this purpose, a novel type of four-circle X-ray diffractometer and a pressure cell were developed. The lattice parameter was found to change as expected from the uniaxial strain created in the sample. The structure analysis based on 936 Bragg reflections suggests that the electronic system becomes more isotropic in the conducting plane and the density-of-states at the Fermi level increases by about 7% under the uniaxial strain created by the piston pressure of 0.1 GPa applied parallel to the b*-axis. This change in the density-of-states is consistent with the observed increase in the superconducting critical temperature from 1.5 to 2 K in the framework of the BSC expression.

Original languageEnglish
Pages (from-to)307-311
Number of pages5
JournalCurrent Applied Physics
Volume1
Issue number4-5
DOIs
Publication statusPublished - Nov 1 2001
Externally publishedYes

Keywords

  • 07.85.Jy
  • 61.10.-i
  • 74.62.Fj
  • 74.70.Kn
  • Crystal structure
  • Organic superconductor
  • Uniaxial compression
  • Uniaxial strain
  • X-ray diffraction

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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