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2011 (v1)PublicationUploaded on: March 31, 2023
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2008 (v1)Publication
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Uploaded on: March 25, 2023 -
2016 (v1)Publication
Herewith, we review the available experimental data of thermoelectric transport properties of iron-based superconductors and parent compounds. We discuss possible physical mechanisms into play in determining the Seebeck effect, from whence one can extract information about Fermi surface reconstruction and Lifshitz transitions, multiband...
Uploaded on: July 1, 2023 -
2003 (v1)Publication
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Uploaded on: April 14, 2023 -
2012 (v1)Publication
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Uploaded on: May 13, 2023 -
2010 (v1)Publication
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Uploaded on: April 14, 2023 -
1998 (v1)Publication
We discuss thermoelectric measurements of high-temperature superconductors around the superconducting transition. The Seebeck effect coefficient has been widely used to study the dissipative phenomena of the vortex lattice and its interaction with quasiparticles, in conjunction with the resistivity to which it is correlated in the framework of...
Uploaded on: April 14, 2023 -
2001 (v1)Publication
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Uploaded on: March 25, 2023 -
2004 (v1)Publication
There is presently a general agreement that the simple inter-metallic compound MgB2 is a conventional, phonon mediated, Superconductor, and that the anomalies in its behaviour can be consistently explained by the existence of two different gaps. We present a study of the complex conductivity as a function of temperature in pure and Al-doped...
Uploaded on: April 14, 2023 -
2001 (v1)Publication
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Uploaded on: March 31, 2023 -
2006 (v1)Publication
We report specific heat measurements on neutron-irradiated MgB2 samples, for which the critical temperature is lowered to 8.7 K, but the superconducting transition remains extremely sharp, indicative of a defect structure extremely homogeneous. Our results evidence the presence of two superconducting gaps in the temperature range above 21 K,...
Uploaded on: March 25, 2023 -
2001 (v1)Publication
In this paper we describe an apparatus for static measurements of the thermal conductivity of Bi(2223)/Ag-sheathed tapes in a temperature range going from 4K to 200K, The standard experimental technique has been improved by the implementation of an original sample arrangement that minimizes the thermal losses by radiation. We have performed a...
Uploaded on: March 27, 2023 -
2007 (v1)Publication
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...
Uploaded on: March 27, 2023 -
2004 (v1)Publication
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Uploaded on: October 11, 2023 -
2002 (v1)Publication
We report on the structural, electrical and magnetic properties of RuSr2GdCu2O8 samples made by systematic synthesis work so that they differ from one another in number of annealings and sintering temperature. Our aim is to highlight the different behaviours as a consequence of the thermal treatments. In particular, we deal with the onset of...
Uploaded on: March 31, 2023 -
2012 (v1)Publication
Three years since the discovery by the Hosono's group of Fe-based superconductors, an enormous number of compounds, belonging to several different families have been discovered and fundamental properties have been deeply investigated in order to clarify the interplay between magnetisms and superconductivity in these compounds. Indeed, the...
Uploaded on: March 31, 2023 -
2015 (v1)Publication
In this work, the feasibility condition of Powder-In-Tube (PIT) processed wires of Fe(Se,Te) superconductor has been investigated. We faced several technical issues that are extensively described and discussed. In particular, we tested different metals and alloys as external sheaths (Cu, Ag, Nb, Ta, Ni, Fe, cupronickel, brass) concluding that...
Uploaded on: April 14, 2023 -
2004 (v1)Publication
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...
Uploaded on: March 25, 2023