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Mobility-controlled extremely large magnetoresistance in perfect electron-hole compensated α-WP_2 crystals

机译:完美的电子-空穴补偿α-WP_2晶体中受迁移率控制的极大的磁阻

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摘要

Recent studies discovered that the binary transition-metal compounds A_xB_y demonstrate extremely large magnetoresistance (XMR) under magnetic field B, for example, 10~6% in PtBi_2 and 10~5% in WTe_2. The underlying physical origins, however, are quite diverse, such as electron-hole balance, backscattering forbidden of Dirac/Weyl fermions, and high mobility. Here we experimentally find an ideal compound (α-WP_2) where the perfect electron-hole compensation can be sustained within a large temperature range (from 2 to 100 K). The XMR of α-WP_2 is measured as high as 8.74x 10~5% under 9 T B at 2 K, but it is remarkably decreased from 8.74x 10~5% to 18% when the temperature is raised from 2 to 100 K; simultaneously, the mobility is decreased by more than two orders of magnitude. Magnetotransport characterizations show that MR is proportional to B~2 and the pronounced dHvA quantum oscillations come from the conventional Schrodinger fermions in α-WP_2, which rules out the possibility of Dirac fermions. These evidences strongly suggest that XMR observed in binary A_xB_y semimetals is mainly attributed to high mobility, rather than Dirac/Weyl fermions. or resonant electron-hole compensation. This work elucidates the underlying physical origin of XMR in these compounds.
机译:最近的研究发现,二元过渡金属化合物A_xB_y在磁场B下表现出极大的磁阻(XMR),例如PtBi_2为10〜6%,而WTe_2为10〜5%。但是,潜在的物理起源非常多样,例如电子-空穴平衡,狄拉克/魏尔费米子禁止的反向散射以及高迁移率。在这里,我们通过实验找到了理想的化合物(α-WP_2),可以在较大的温度范围(2至100 K)内维持理想的电子空穴补偿。在2 K下,在9 T B下测得的α-WP_2XMR高达8.74x 10〜5%,但当温度从2 K升高到100 K时,XMR从8.74x 10〜5%显着降低到18%。同时,迁移率降低了两个以上数量级。磁输运表征表明,MR与B〜2成正比,明显的dHvA量子振荡来自α-WP_2中常规的薛定inger费米子,这排除了狄拉克费米子的可能性。这些证据强烈表明,在二元A_xB_y半金属中观察到的XMR主要归因于高迁移率,而不是Dirac / Weyl费米子。或共振电子空穴补偿。这项工作阐明了这些化合物中XMR的潜在物理起源。

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  • 来源
    《Physical review》 |2018年第24期|245151.1-245151.9|共9页
  • 作者单位

    National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;

    National Laboratory of Solid State Microstructures & Department of Physics, Nanjing University, Nanjing 210093, China;

    Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China;

    National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;

    National Laboratory of Solid State Microstructures & Department of Physics, Nanjing University, Nanjing 210093, China;

    National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;

    Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, School of Materials Science and Engineering & State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

    National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;

    National Laboratory of Solid State Microstructures & Department of Physics, Nanjing University, Nanjing 210093, China;

    National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;

    National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;

    National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;

    National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;

    Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China,Collaborative Innovation Center of Advanced Microstructure, Nanjing University, Nanjing 210093, China;

    National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China,Collaborative Innovation Center of Advanced Microstructure, Nanjing University, Nanjing 210093, China;

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