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27 April 2024

» arxiv » 0807.1263

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A final experimental confirmation of the low B isotope coefficient in MgB2
P.Brotto ; M.Tropeano ; C.Ferdeghini ; P.Manfrinetti ; A.Palenzona ; E.Galleani d Agliano ; M.Putti ;
Date:	8 Jul 2008
Abstract:	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.
Source:	arXiv, 0807.1263
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