High unsaturated room-temperature magnetoresistance in phase-engineered MoxW1−xTe2+δ ultrathin films
| Autor: | Yit-Tsong Chen, Christy Roshini Paul Inbaraj, Shemsia Mohammed Hudie, Roshan Jesus Mathew, Chih-Hao Lee, Raman Sankar, Revannath Dnyandeo Nikam, Chi-Ang Tseng |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Condensed matter physics Magnetoresistance 02 engineering and technology General Chemistry Substrate (electronics) Chemical vapor deposition Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Weak localization Crystal Phase (matter) Materials Chemistry Thin film 0210 nano-technology |
| Zdroj: | Journal of Materials Chemistry C. 7:10996-11004 |
| ISSN: | 2050-7534 2050-7526 |
| DOI: | 10.1039/c9tc02842k |
| Popis: | 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 using an atmospheric-pressure chemical vapor deposition (APCVD) method. The Td-Mo0.27W0.71Te2.02 with average mobility of 725 cm2 V−1 s−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. |
| Databáze: | OpenAIRE |
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