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The advent of nodal-line semi-metals, i.e. systems in which the conductionand valence bands cross each other along a closed trajectory (line or loop)inside the Brillouin zone, has opened up a new arena for the exploration oftopological condensed matter in which, due to a vanishing density of statesnear the Fermi level, electron correlation effects may also play an importantrole. In spite of this conceptual richness however, material realization ofnodal-line (loop) fermions is rare, with PbTaSe2, ZrSiS and PtSn4 the onlypromising known candidates. Here we report the synthesis and physicalproperties of a new compound PdSn4 that is isostructural with PtSn4 yetpossesses quasiparticles with significantly enhanced effective masses. Inaddition, PdSn4 displays an unusual polar angular magnetoresistance which at acertain field orientation, varies linearly with field up to 55 Tesla. Our studysuggests that, in association with its homologue PtSn4 whose low-lyingexcitations were recently claimed to possess Dirac node arcs, PdSn4 may be apromising candidate in the search for novel topological states with enhancedcorrelation effects.

Enhanced electron correlations in the new binary stannide PdSn4: a homologue of the Dirac nodal arc semimetal PtSn4