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- W3033130080 abstract "DyPdBi (DPB) is a topological semimetal which belongs to the rare-earth-based half-Heusler alloy family. In this work, we studied the thickness-dependent structural and magneto-transport properties of DPB thin films (20 to 60 nm) grown using pulsed laser deposition. The DPB thin films show (110) oriented growth on MgO(100) single crystal substrates. Longitudinal resistance data indicate metallic surface states dominated carrier transport and the suppression of semiconducting bulk state carriers for films ≤40 nm. We observe the weak antilocalization (WAL) effect and Shubnikov–de Hass (SdH) oscillations in the magneto-transport data. The presence of a single coherent transport channel (α∼ −0.50) is observed in the Hikami–Larkin–Nagaoka (HLN) fitting of WAL data. The power law temperature dependence of phase coherence length (LØ) ∼ T−0.50 indicates the observation of the 2D WAL effect and the presence of topological nontrivial surface states for films ≤40 nm. The 60 nm sample shows semiconducting resistivity behavior at higher temperature (>180 K) and HLN fitting results (α∼ −0.72, LØ∼ T−0.68) indicate the presence of partial decoupled top and bottom surface states. The Berry phase ∼π is extracted for thin films ≤40 nm, which further demonstrates the presence of Dirac fermions and nontrivial surface states. Band structure parameters are extracted by fitting SdH data to the standard Lifshitz–Kosevich formula. The sheet carrier concentration and cyclotron effective mass of carriers decrease with increasing thickness (20 nm to 60 nm) from ∼1.35 × 1012 cm−2 to 0.68 × 1012 cm−2 and from ∼0.26 me to 0.12 me, respectively. Our observations suggest that samples with a thickness ≤40 nm have transport properties dominated by surface states and samples with a thickness ≥60 nm have contributions from both bulk and surface states." @default.
- W3033130080 created "2020-06-12" @default.
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- W3033130080 date "2020-07-06" @default.
- W3033130080 modified "2023-10-15" @default.
- W3033130080 title "Thickness-dependent magneto-transport properties of topologically nontrivial DyPdBi thin films" @default.
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- W3033130080 doi "https://doi.org/10.1088/1361-6528/ab99f3" @default.
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