Detailed Study of the Fermi Surfaces of the Type-II Dirac Semimetallic Candidates XTe₂ (X =Pd, Pt)

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dc.contributor.ORCID0000-0003-4434-2160 (Chan, JY)
dc.contributor.authorZheng, W.
dc.contributor.authorSchönemann, R.
dc.contributor.authorAryal, N.
dc.contributor.authorZhou, Q.
dc.contributor.authorRhodes, D.
dc.contributor.authorChiu, Y. -C
dc.contributor.authorChen, K. -W
dc.contributor.authorKampert, E.
dc.contributor.authorFörster, T.
dc.contributor.authorMartin, T. J.
dc.contributor.authorMcCandless, Gregory T.
dc.contributor.authorChan, Julia Y.
dc.contributor.authorManousakis, E.
dc.contributor.authorBalicas, L.
dc.contributor.utdAuthorMartin, T. J.
dc.contributor.utdAuthorMcCandless, Gregory T.
dc.contributor.utdAuthorChan, Julia Y.
dc.date.accessioned2019-07-26T17:31:00Z
dc.date.available2019-07-26T17:31:00Z
dc.date.created2018-06-29
dc.description.abstractWe present a detailed quantum oscillatory study on the Dirac type-II semimetallic candidates PdTe₂ and PtTe₂ via the temperature and the angular dependence of the de Haas-van Alphen and Shubnikov-de Haas effects. In high-quality single crystals of both compounds, i.e., displaying carrier mobilities between 10³ and 10⁴ cm²/Vs, we observed a large nonsaturating magnetoresistivity which in PtTe₂ at a temperature T=1.3 K leads to an increase in the resistivity up to (5×10⁴)% under a magnetic field μ₀H=62 T. These high mobilities correlate with their light effective masses in the range of 0.04 to 1 bare electron mass according to our measurements. For PdTe₂ the experimentally determined Fermi surface cross-sectional areas show excellent agreement with those resulting from band structure calculations. Surprisingly, this is not the case for PtTe₂, whose agreement between calculations and experiments is relatively poor even when electronic correlations are included in the calculations. Therefore, our study provides strong support for the existence of a Dirac type-II node in PdTe₂ and probably also for PtTe₂. Band structure calculations indicate that the topologically nontrivial bands of PtTe₂ do not cross the Fermi level. In contrast, for PdTe₂ the Dirac type-II cone does intersect, although our calculations also indicate that the associated cyclotron orbit on the Fermi surface is located in a distinct k_z plane with respect to that of the Dirac type-II node. Therefore, it should yield a trivial Berry phase.
dc.description.departmentSchool of Natural Sciences and Mathematics
dc.identifier.bibliographicCitationZheng, W., R. Schönemann, N. Aryal, Q. Zhou, et al. 2018. "Detailed study of the Fermi surfaces of the type-II Dirac semimetallic candidates XTe2 (X =Pd, Pt)." Physical Review B 97(235154): 1-10, doi:10.1103/PhysRevB.97.235154
dc.identifier.issn2469-9950
dc.identifier.issue235154
dc.identifier.urihttps://hdl.handle.net/10735.1/6747
dc.identifier.volume97
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevB.97.235154
dc.rights©2018 American Physical Society
dc.source.journalPhysical Review B
dc.subjectSuperconductivity
dc.subjectCondensed Matter
dc.subjectPalladium(II) Telluride
dc.subjectPlatinum(IV) Telluride
dc.subjectFermi surfaces
dc.titleDetailed Study of the Fermi Surfaces of the Type-II Dirac Semimetallic Candidates XTe₂ (X =Pd, Pt)
dc.type.genrearticle

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