De Hass-van Alphen and magnetoresistance reveal predominantly single-band transport behavior in PdTe2

Abstract

Research on two-dimensional transition metal dichalcogenides (TMDs) has grown rapidly over the past several years, from fundamental studies to the development of next generation technologies. Recently, it has been reported that the MX2-type PdTe2 exhibits superconductivity with topological surface state, making this compound a promising candidate for investigating possible topological superconductivity. However, due to the multi-band feature of most of TMDs, the investigating of magnetoresistance and quantum oscillations of these TMDs proves to be quite complicated. Here we report a combined de Hass-van Alphen effect and magnetoresistance studies on the PdTe2 single crystal. Our high-field de Hass-van Alphen data measured at different temperature and different tilting angle suggest that though these is a well-defined multi-band feature, a predominant oscillation frequency has the largest oscillation magnitude in the fast Fourier transformation spectra, which is at least one order of magnitude larger than other oscillation frequencies. Thus it is likely that the transport behavior in PdTe2 system can be simplified into a single-band model. Meanwhile, the magnetoresistance results of the PdTe2 sample can be well-fitted according to the single-band models. The present results could be important in further investigation of the transport behaviors of two-dimensional TMDs.

Large nonsaturating magnetoresistance and pressure-induced phase transition in the layered semimetal HfTe2

“…The maximum reported values for the MR are 1.75 × 10 6 % for WTe 2 [56] and 7.5 × 10 4 % for MoTe 2 [15] (T = 2 K and μ 0 H = 9 T). Under the same conditions, for PdTe 2 (isostructural to HfTe 2 ) prepared from high-purity elements a rather low maximum MR of ∼150% was reported [57]. Hence, it can be concluded that besides the actual electronic band structure, the purity of the materials and the crystal quality determine the MR value.…”

Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe2

“…More recently, the transition metal dichalcogenides (TMDs) TMX 2 (TM=Pd, Pt; X=Se, Te) were proposed to host type-II Dirac fermions and were soon verified in angle-resolved photoemission spectroscopy (ARPES) experiments. [17][18][19][20][21][22][23][24][25][26][27][28] Interestingly, PdTe 2 also superconducts below T c =2 K and the Au substitution can boost T c to a maximum value of 4.7 K, making this family of TMDs a promising platform to search for topological superconductors. [29][30][31][32][33][34] However, the Dirac points reported in these materials are located deeply below the Fermi level, with a binding energy of 0.6 eV in PdTe 2 , 0.8 eV in PtTe 2 , and 1.2 eV in PtSe 2 .…”

Detailed study of the Fermi surfaces of the type-II Dirac semimetallic candidates XTe2 ( X =Pd, Pt)

“…Although the magnetoresistance and magnetization measurements of both PtTe 2 and PdTe 2 have been reported in the last year [24,31], detailed information about the Fermi surface topography extracted from angular dependence of bulk measurements like the de Haasvan Alphen (dHvA) and Shubnikov-de Haas (SdH) effects along with a comparison with Density Functional Theory (DFT) calculations are still missing. Notice for instance, that the initial report on the dHvA-effect in PdTe 2 revealed just a few Fermi surface cross-sectional areas, e.g.…”