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High Unsaturated Room-Temperature Magnetoresistance in Phase-Engineered MoxW1-xTe2+δ Ultrathin Films

Abstract

Highly stable ultrathin films of large unsaturated room-temperature magnetoresistance (MR) are essential for the next-generation real-time magnetoelectric devices. A large-area, transfer-free, highly crystalline, and phase-engineered ultrathin film of Td-Mo0.27W0.71Te2.02 or 2H- & Td-Mo0.22W0.89Te1.89 on a hexagonal boron nitride (h-BN) substrate was synthesized with an atmospheric-pressure chemical vapor deposition (APCVD) method. The Td-Mo0.27W0.71Te2.02 with average mobility of 725 cm2V-1s-1 possesses non-saturating MR of 18 % at 5 K and 11 % at room temperature. Quantum correction to the magnetotransport study suggests the existence of a weak anti-localization effect dominated by the electron-electron interaction to render the non-saturating linear MR in a wide temperature range. Moreover, the spin-orbit interaction in Td-Mo0.27W0.71Te2.02 was found valid till an applied field of 0.05 T with an interaction length of 18 nm at 300 K. In this alloy system, the weak localization effect was evidenced unprecedentedly by the Te-deficient 2H- & Td-Mo0.22W0.89Te1.89 thin film with unusual co-existence of two crystal phases, which exhibit a suppressed MR caused by the recurring inelastic scattering with a reduced phase coherence length. This work explores the production of phase-engineered large-area Weyl semi-metallic 2D materials for the realization of magnetoelectrics in the near future. -

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Publication details

The article was received on 28 May 2019, accepted on 02 Aug 2019 and first published on 05 Aug 2019


Article type: Paper
DOI: 10.1039/C9TC02842K
J. Mater. Chem. C, 2019, Accepted Manuscript

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    High Unsaturated Room-Temperature Magnetoresistance in Phase-Engineered MoxW1-xTe2+δ Ultrathin Films

    R. J. Mathew, C. R. Paul Inbaraj, R. Sankar, S. M. Hudie, D. N. Revannath , C. Tseng, C. Lee and Y. Chen, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C9TC02842K

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