GALLEANI D'AGLIANO , Enrico

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One of the most important predictions of the two-gap theory of superconductivity concerns the role of interband scattering (IBS) by impurities. IBS is expected to decrease the critical temperature, Tc, of MgB2 to a saturation value of about 20 K, where the two gaps merge to a single one. These predictions have been partially contradicted by...

We present thermal conductivity and specific heat measurements on MgB2 and Mg-AlB2 samples. Thermal properties have been analyzed by using a two-gap model in order to estimate the gap amplitudes, Delta(0)(pi) and Delta(0)(sigma) and the intra-band scattering rates, Gamma(sigmasigma) and Gamma(pipi). Delta(0)(sigma) rapidly decreases as a...

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We present resistivity and thermal conductivity measurements on bulk samples., prepared either by a standard method or by a one-step technique. The latter samples, due to their high density and purity, show residual resistivity values as low as 0.5 muOmega cm and thermal conductivity values as high as 215 W mK(-1), higher than the...

We present thermal conductivity measurements on very pure and dense bulk samples, as indicated by residual resistivity values as low as 0.5 mV cm and thermal conductivity values higher than 200 W/mK. In the normal state we found that the Wiedemann-Franz law, in its generalized form, works well suggesting that phonons do not contribute to the...

A comparative study of thermal properties of SmFeAsO, SmFeAsO0.93F0.07, and SmFeAsO0.85F0.15 samples is presented. Specific heat and thermal conductivity show clear evidence of the spin-density wave SDW ordering below TSDW135 K in undoped SmFeAsO. At low level of F doping, SmFeAsO0.93F0.07, SDW ordering is suppressed and superconducting...

We report measurements of the resistivity, rho, and the Seebeck coefficient, S, of a MgB2 sintered sample, and compare S with theoretical calculations based on precise electronic structure calculations. rho is fitted well by a generalized Bloch-Gruneisen equation with a Debye temperature circle minus(R) of 1050 K. S is given by the sum of a,...

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We report magnetoresistance ( MR) measurements on MgB2 and the corresponding full account from ab initio calculations; we suggest that this combination can be a useful tool to probe electron-phonon coupling. We obtain good quantitative agreement between high-field measurements on neutron-irradiated epitaxial thin films and calculations within...