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Superconductivity is due to an attractive interaction between electrons that, below a critical temperature, drives them to form Cooper pairs and to condense into a ground state separated by an energy gap from the unpaired states. In the simplest cases, the pairing is mediated by lattice vibrations and the wavefunction of the pairs is isotropic. Less(More)
Iron-based compounds (IBS) display a surprising variety of superconducting properties that seems to arise from the strong sensitivity of these systems to tiny details of the lattice structure. In this respect, systems that become superconducting under pressure, like CaFe2As2, are of particular interest. Here we report on the first directional point-contact(More)
We investigate the effect of various symmetries of the superconducting order parameter ∆(ω) on the normalized tunneling conductance of SIN junctions by directly solving the real-axis Eliash-berg equations (EEs) for a half-filled infinite band, with the simplifying assumption µ * = 0. We analyze six different symmetries of the order parameter: s, d, s + id,(More)
We present the results of the first directional point-contact spectroscopy experiments in high-quality MgB2 single crystals. Because of the directionality of the current injection into the samples, the application of a magnetic field allowed us to separate the contributions of the sigma and pi bands to the total conductance of our point contacts. By using(More)
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