Determination of superconducting gap of SmFeAsFxO1-x superconductors by Andreev reflection spectroscopy

T. Y. Chen, Sunxiang Huang, Z. Tesanovic, R. H. Liu, X. H. Chen, C. L. Chien

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The superconducting gap in FeAs-based superconductor SmFeAs(O1-xFx) (x = 0.15 and 0.30) and the temperature dependence of the sample with x = 0.15 have been measured by Andreev reflection spectroscopy. The intrinsic superconducting gap is independent of contacts while many other "gap-like" features vary appreciably for different contacts. The determined gap value of 2Δ = 13.34 ± 0.47 meV for SmFeAs(O0.85F0.15) gives 2Δ/kBTC = 3.68, close to the BCS prediction of 3.53. The superconducting gap decreases with temperature and vanishes at TC, in a manner similar to the BCS behavior but dramatically different from that of the nodal pseudogap behavior in cuprate superconductors.

Original languageEnglish (US)
Pages (from-to)521-528
Number of pages8
JournalPhysica C: Superconductivity and its Applications
Volume469
Issue number9-12
DOIs
StatePublished - 2009
Externally publishedYes

Fingerprint

Superconducting materials
Spectroscopy
spectroscopy
Temperature
cuprates
temperature dependence
predictions
Cuprate superconductors
temperature

Keywords

  • Andreev reflection spectroscopy
  • Fe-superconductors
  • Point contact
  • Superconducting gap

ASJC Scopus subject areas

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

Cite this

Determination of superconducting gap of SmFeAsFxO1-x superconductors by Andreev reflection spectroscopy. / Chen, T. Y.; Huang, Sunxiang; Tesanovic, Z.; Liu, R. H.; Chen, X. H.; Chien, C. L.

In: Physica C: Superconductivity and its Applications, Vol. 469, No. 9-12, 2009, p. 521-528.

Research output: Contribution to journalArticle

Chen, T. Y. ; Huang, Sunxiang ; Tesanovic, Z. ; Liu, R. H. ; Chen, X. H. ; Chien, C. L. / Determination of superconducting gap of SmFeAsFxO1-x superconductors by Andreev reflection spectroscopy. In: Physica C: Superconductivity and its Applications. 2009 ; Vol. 469, No. 9-12. pp. 521-528.
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AU - Chien, C. L.

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