Experimental confirmation of the low B isotope coefficient in MgB2

Details Experimental confirmation of the low B isotope coefficient in MgB2 Experimental confirmation of the low B isotope coefficient in MgB2

2008-07-08

arxiv.org/abs/0807.1263v2

P.Brotto, M.Tropeano, C.Ferdeghini, P.Manfrinetti, A.Palenzona, E.Galleani d Agliano, M.Putti, Physical Review B 78 092502 (20

Physics

Condensed Matter

Superconductivity

8 pages, 3 figures Title has been changed A statement has been added in page 7 of the pdf file "Finally we would..." Reference

Scientific paper

10.1103/PhysRevB.78.092502

Recent investigations have shown that the first proposed explanations of the disagreement between experimental and theoretical value of isotope coefficient in MgB2 need to be reconsidered. Considering that in samples with residual resistivity of few mu-Ohm cm critical temperature variations produced by disorder effects can be comparable with variations due to the isotopic effect, we adopt a procedure in evaluating the B isotope coefficient which take account of these effects, obtaining a value which is in agreement with previous results and then confirming that there is something still unclear in the physics of MgB2.

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