Journal
PHYSICAL REVIEW B
Volume 79, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.224517
Keywords
band structure; high-temperature superconductors; iron compounds; lanthanum compounds; materials preparation; reflectivity; superconductor-normal-superconductor devices; X-ray spectra
Funding
- RFBR [08-02-00935, 05-02-17868, 08-02-90401]
- DFG [436RUS113, 538/BU887/4]
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Current-voltage characteristics of Andreev contacts in LaFeAsO0.9F0.1 have been measured using the break-junction technique. The contacts were prepared at T=4.2 K from polycrystalline samples and exhibit superconductor/normal conductor/superconductor-type behavior due to multiple Andreev reflections. Two sets of subharmonic gap structures were detected indicating the existence of two distinct superconducting gaps: Delta(L)=(5.5 +/- 1) meV and Delta(S)=(1 +/- 0.2) meV.
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