Point-contact investigations of challenging superconductors: two-band MgB2, antiferromagnetic HoNi2B2C, heavy fermion UPd2Al3, paramagnetic MgCNi3

D. Souptel; G. Behr; G. Fuchs; I. K. Yanson; K. Gloos; K. Nenkov; O. E. Kvitnitskaya; S.-L. Drechsler; Yu. G. Naidyuk

arxiv: cond-mat/0410480 · v1 · submitted 2004-10-19 · ❄️ cond-mat.supr-con · cond-mat.str-el

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

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K. Gloos

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classification ❄️ cond-mat.supr-con cond-mat.str-el

keywords antiferromagnetichoni2b2cmgb2mgcni3point-contactsuperconductorsupd2al3break-junctions

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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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Point-contact investigations of challenging superconductors: two-band MgB2, antiferromagnetic HoNi2B2C, heavy fermion UPd2Al3, paramagnetic MgCNi3

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