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- Istituto Nazionale di Fisica Nucleare, Sezione di TorinoIT56 papers
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12 papers · 1 filter
Field-induced suppression of the pi-band superconductivity and magnetic hysteresis in the microwave surface resistance of MgB_2 at temperatures near T_c
M. Bonura, A. Agliolo Gallitto, M. Li Vigni +1
We report on the magnetic-field-induced variations of the microwave surface resistance, R_s, in a polycrystalline MgB_2 sample, at different values of temperature. We have detected…
Point-contact Andreev-reflection spectroscopy in ReFeAsO_{1-x}F_x (Re = La, Sm): Possible evidence for two nodeless gaps
R. S. Gonnelli, D. Daghero, M. Tortello +6
A deep understanding of the character of superconductivity in the recently discovered Fe-based oxypnictides ReFeAsO1-xFx (Re = rare-earth) necessarily requires the determination of…
Adiabatic Magnetization of Superconductors as a High-Performance Cooling Mechanism
F. Dolcini, F. Giazotto
The adiabatic magnetization of a superconductor is a cooling principle proposed in the 30s, which has never been exploited up to now. Here we present a detailed dynamic description…
Coexistence of two order parameters and a pseudogaplike feature in the iron-based superconductor LaFeAsO_(1-x)F_x
R. S. Gonnelli, D. Daghero, M. Tortello +4
The nature and value of the order parameters (OPs) in the superconducting Fe-based oxypnictides REFeAsO_(1-x)F_x (RE = rare earth) are a matter of intense debate, also connected to…
Evidence for gap anisotropy in CaC6 from directional point-contact spectroscopy
R. S. Gonnelli, D. Daghero, D. Delaude +8
We present the first results of directional point-contact spectroscopy in high quality CaC6 samples both along the ab plane and in the c-axis direction. The superconducting order p…
Strong-coupling properties of unbalanced Eliashberg superconductors
E. Cappelluti, G. A. Ummarino
In this paper we investigate the thermodynamical properties of ``unbalanced'' superconductors, namely, systems where the electron-boson coupling is different in the self-energy…