Effect of Post-Annealing on Magnetotransport and Magnetic Properties of TaCo 2 Te 2 Single Crystals

作者：Longsheng Wang, Jianjun Tian, Chaoyang Kang, Haiyang Gu, Rui Pang, Mengna Shen, Limin She, Ye‐Heng Song, Xiansheng Liu, Weifeng Zhang · 发表于：Inorganic Chemistry · 年份：2022 · DOI：10.1021/acs.inorgchem.2c02801 · 被引用次数：6 · 研究领域：Magnetic and transport properties of perovskites and related materials、2D Materials and Applications、Iron-based superconductors research

The extreme magnetoresistance (XMR) of some compounds, challenging our understanding of magnetoresistance, is an interesting topic in condensed-matter and materials physics and future device applications. Here, we reported magnetotransport and magnetic properties of the as-grown and post-annealed TaCo 2 Te 2 single crystals. The resistivity evolution with temperature in the two TaCo 2 Te 2 single crystals shows a metallic behavior. Below 50 K, the XMR effect for the two crystals is found, and MR values at 3 K under 9 T are about 3.72 × 10 3 % for the as-grown TaCo 2 Te 2 and 5.71 × 10 2 % for the annealed samples, larger than that of the previous report. The studies on the Hall effect of the two TaCo 2 Te 2 single crystals indicate the multiband feature with high carrier mobilities from a two-band model. Electron and hole concentrations and mobilities of as-grown samples are comparable, while for the annealed sample, the hole concentration and mobility are larger than the electron concentration and mobility. The carrier mobilities for the two TaCo 2 Te 2 single crystals have the same order of magnitude, ∼10 3 cm 2 V –1 s –1 . The XMR effect may be from high carrier mobilities. Magnetization of the as-grown TaCo 2 Te 2 decreases with increasing temperature, and a weaker magnetic transition at ∼150 K is observed. The annealed TaCo 2 Te 2 shows no magnetic transition and just a paramagnetic behavior with rising temperature. These results indicate that defects/deficiencies may pl...