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24 April 2024 |
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Multi-gap superconductivity in a BaFe1.84Co0.16As2 film from optical measurements at terahertz frequencies | | A. Perucchi
; L. Baldassarre
; C. Marini
; S. Lupi
; J. Jiang
; J.D. Weiss
; E.E. Hellstrom
; S. Lee
; C.W. Bark
; C.B. Eom
; M. Putti
; I. Pallecchi
; P. Dore
; | | Date: |
2 Mar 2010 | | Abstract: | We measured the THz reflectance properties of a high quality epitaxial thin
film of the Fe-based superconductor BaFe$_{1.84}$Co$_{0.16}$As$_2$ with
T$_c$=22.5 K. The film was grown by pulsed laser deposition on a DyScO$_3$
substrate with an epitaxial SrTiO$_3$ intermediate layer. The measured
$R_S/R_N$ spectrum, i.e. the reflectivity ratio between the superconducting and
normal state reflectance, provides clear evidence of a superconducting gap
$Delta_A$ close to 15 cm$^{-1}$. A detailed data analysis shows that a
two-band, two-gap model is absolutely necessary to obtain a good description of
the measured $R_S/R_N$ spectrum. The low-energy $Delta_A$ gap results to be
well determined ($Delta_A$=15.5$pm$0.5 cm$^{-1}$), while the value of the
high-energy gap $Delta_B$ is more uncertain ($Delta_B$=55$pm$7 cm$^{-1}$).
Our results provide evidence of a nodeless isotropic double-gap scenario, with
the presence of two optical gaps corresponding to 2$Delta/kT_c$ values close
to 2 and 7. | | Source: | arXiv, 1003.0565 | | Services: | Forum | Review | PDF | Favorites | |
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