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Paper detail

Multigap superconductivity and strong electron-boson coupling in Fe-based superconductors: A point-contact Andreev-reflection study of Ba(Fe1-xCox)2As2 single crystals

Directional point-contact Andreev-reflection (PCAR) measurements in Ba(Fe1-xCox)2As2 single crystals (Tc=24.5 K) indicate the presence of two superconducting gaps with no line nodes on the Fermi surface. The PCAR spectra also feature additional structures related to the electron-boson interaction, from which the characteristic boson energy Omega_b(T) is obtained, very similar to the spin-resonance energy observed in neutron scattering experiments. Both the gaps and the additional structures can be reproduced within a three-band s+- Eliashberg model by using an electron-boson spectral function peaked at Omega_0 = 12 meV ~ Omega_b(0).

preprint2010arXivOpen access
M. TortelloD. DagheroG. A. UmmarinoV. A. StepanovJ. JiangJ. D. WeissE. E. HellstromR. S. Gonnelli
cond-mat.supr-con
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M. TortelloD. DagheroG. A. UmmarinoV. A. StepanovJ. JiangJ. D. WeissE. E. HellstromR. S. Gonnelli

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