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Point-contact spectroscopy in segregation-free Al-doped MgB2 single crystals and polycrystals | | D. Daghero
; D. Delaude
; A. Calzolari
; M. Tortello
; G.A. Ummarino
; R.S. Gonnelli
; V.A. Stepanov
; N.D. Zhigadlo
; J. Karpinski
; A. Palenzona
; | | Date: |
1 Aug 2006 | | Subject: | Superconductivity; Materials Science | | Abstract: | We present new results of point-contact spectroscopy in single-phase Mg_(1-x)Al_xB_2 single crystals with x up to ~ 0.3. Fitting the conductance curves of our point contacts with the two-band Blonder-Tinkham-Klapwijk model allowed us to extract the gap amplitudes Delta_sigma and Delta_pi. Once reported as a function of the local critical temperature of the junctions, TcA, the gap values turn out to agree rather well with those previously obtained by us in high-quality polycrystalline samples and here extended to higher doping levels (x=0.3). In both single crystals and polycrystals there is no tendency to gap merging down to the lowest critical temperature TcA ~ 9 K. A detailed analysis of the data within the two-band Eliashberg theory shows that, while in polycrystals the gap trend can be rather well explained by the electron doping introduced by Al substitutions, in single crystals a substantial increase in the interband scattering is necessary to account for a small increase in Delta_pi at low Al contents. | | Source: | arXiv, cond-mat/0608029 | | Services: | Forum | Review | PDF | Favorites | |
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