Point-contact investigations of challenging superconductors: two-band MgB2, antiferromagnetic HoNi2B2C, heavy fermion UPd2Al3, paramagnetic MgCNi3
Yu. G. Naidyuk, O. E. Kvitnitskaya, I. K. Yanson, G. Fuchs, K. Nenkov,, S.-L. Drechsler, G. Behr, D. Souptel, and K. Gloos
TL;DR
This paper reviews recent point-contact spectroscopy studies on various challenging superconductors, revealing their complex electronic and magnetic properties through experimental spectra and conductance measurements.
Contribution
It provides new insights into the multi-band structure, magnetic effects, and phonon features of MgB2, HoNi2B2C, UPd2Al3, and MgCNi3 using point-contact spectroscopy.
Findings
Observation of phonon features and crystal-electric-field effects in HoNi2B2C
Study of multi-band superconducting gap in MgB2
Analysis of nonlinear I(V) curves in UPd2Al3 and MgCNi3
Abstract
An overview on recent efforts in point-contact (PC) spectroscopy of title superconductors is given. Distinct phonon features and crystalline-electric-field effects are observed in PC spectra of HoNi2B2C. Results of study of superconducting (SC) gap and excess current versus temperature and magnetic field reflecting specific multi-band electronic structure in MgB2 are presented. The nature of the extremely nonlinear I(V) curves in the antiferromagnetic (AF) and SC state are elucidated for UPd2Al3 break-junctions and MgCNi3 point contacts.
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