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Point-contact Andreev-reflection spectroscopy in Fe(Te,Se) films: multiband superconductivity and electron-boson coupling | | D. Daghero
; P. Pecchio
; G. A. Ummarino
; F. Nabeshima
; Y. Imai
; A. Maeda
; I. Tsukada
; S. Komiya
; R. S. Gonnelli
; | | Date: |
15 Dec 2014 | | Abstract: | We report on a study of the superconducting order parameter in
Fe(Te$_{1-x}$Se$_{x}$) thin films (with different Se contents: x=0.3, 0.4, 0.5)
by means of point-contact Andreev-reflection spectroscopy (PCARS). The PCARS
spectra show reproducible evidence of multiple structures, namely two clear
conductance maxima associated to a superconducting gap of amplitude $Delta_E
simeq 2.75 k_B T_c$ and additional shoulders at higher energy that, as we
show, are the signature of the strong interaction of charge carriers with a
bosonic mode whose characteristic energy coincides with the spin-resonance
energy. The details of some PCARS spectra at low energy suggest the presence of
a smaller and not easily discernible gap of amplitude $Delta_H simeq 1.75 k_B
T_c$. The existence of this gap and its amplitude are confirmed by PCARS
measurements in Fe(Te$_{1-x}$Se$_{x}$) single crystals. The values of the two
gaps $Delta_E$ and $Delta_H$, once plotted as a function of the local
critical temperature $T_c^A$, turn out to be in perfect agreement with the
results obtained by various experimental techniques reported in literature. | | Source: | arXiv, 1412.4667 | | Services: | Forum | Review | PDF | Favorites | |
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