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arXiv · 1707.00216

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

C. Q. Xu·W. Zhou·R. Sankar·X. Z. Xing·Z. X. Shi·Z. D. Han·B. Qian·J. H. Wang·Zengwei Zhu·J. L. Zhang·A. F. Bangura·N. E. Hussey·Xiaofeng Xu
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Abstract

The advent of nodal-line semi-metals, i.e. systems in which the conduction and 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 of topological condensed matter in which, due to a vanishing density of states near the Fermi level, electron correlation effects may also play an important role. In spite of this conceptual richness however, material realization of nodal-line (loop) fermions is rare, with PbTaSe2, ZrSiS and PtSn4 the only promising known candidates. Here we report the synthesis and physical properties of a new compound PdSn4 that is isostructural with PtSn4 yet possesses quasiparticles with significantly enhanced effective masses. In addition, PdSn4 displays an unusual polar angular magnetoresistance which at a certain field orientation, varies linearly with field up to 55 Tesla. Our study suggests that, in association with its homologue PtSn4 whose low-lying excitations were recently claimed to possess Dirac node arcs, PdSn4 may be a promising candidate in the search for novel topological states with enhanced correlation effects.

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C. Q. Xu, W. Zhou, R. Sankar, X. Z. Xing, Z. X. Shi, Z. D. Han, B. Qian, J. H. Wang, Zengwei Zhu, J. L. Zhang, A. F. Bangura, N. E. Hussey, Xiaofeng Xu. 2017-07-01. Enhanced electron correlations in the new binary stannide PdSn4: a homologue of the Dirac nodal arc semimetal PtSn4. https://doi.org/10.1103/physrevmaterials.1.064201

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