Effect of synthesis conditions on the electrical resistivity of TiSe$_2$
| Autor: | Moya, Jaime M., Huang, C. -L., Choe, Jesse, Costin, Gelu, Foster, Matthew S., Morosan, E. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. Materials 3, 084005 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevMaterials.3.084005 |
| Popis: | Dilute impurities and growth conditions can drastically affect the transport properties of TiSe$_2$, especially below the charge density wave transition. In this paper, we discuss the effects of cooling rate, annealing time and annealing temperature on the transport properties of TiSe$_2$: slow cooling of polycrystalline TiSe$_2$ post-synthesis drastically increases the low temperature resistivity, which is in contrast to the metallic behavior of single-crystalline TiSe$_2$ due to charge doping from the residual iodine transport agent. A logarithmic increase of resistivity upon cooling and negative magnetoresistance with a sharp cusp around zero field are observed for the first time for the polycrystalline TiSe$_2$ samples, pointing to weak-localization effects due to low dimensionality. Annealing at low temperatures has a similar, but less drastic effect. Furthermore, rapid quenching of the polycrystalline samples from high temperatures freezes in disorder, leading to a decrease in the low temperature resistivity. Comment: 8 pages, 6 figures |
| Databáze: | arXiv |
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