Strong paramagnon scattering in single atom Pd contacts

V. Schendel, Cyrille Barreteau, Mads Brandbyge, Bogdana Borca, I. Pentegov, U. Schlickum, M. Ternes, P. Wahl, K. Kern

    Research output: Contribution to journalJournal articleResearchpeer-review

    450 Downloads (Pure)


    Among all transition metals, palladium (Pd) has the highest density of states at the Fermi energy at low temperatures yet does not fulfill the Stoner criterion for ferromagnetism. However, close proximity to magnetism renders it a nearly ferromagnetic metal, which hosts paramagnons, strongly damped spin fluctuations. Here we compare the total and the differential conductance of monoatomic contacts consisting of single Pd and cobalt (Co) atoms between Pd electrodes. Transport measurements reveal a conductance for Co of 1G(0), while for Pd we obtain 2G(0). The differential conductance of monoatomic Pd contacts shows a reduction with increasing bias, which gives rise to a peculiar Lambda-shaped spectrum. Supported by theoretical calculations, we correlate this finding with the lifetime of hot quasiparticles in Pd, which is strongly influenced by paramagnon scattering. In contrast to this, Co adatoms locally induce magnetic order, and transport through single cobalt atoms remains unaffected by paramagnon scattering, consistent with theory.
    Original languageEnglish
    Article number035155
    JournalPhysical Review B
    Issue number3
    Number of pages5
    Publication statusPublished - 2017

    Bibliographical note

    ©2017 American Physical Society


    Dive into the research topics of 'Strong paramagnon scattering in single atom Pd contacts'. Together they form a unique fingerprint.

    Cite this