Magnetotransport properties in antimony single crystals
ORAL
Abstract
The magnetoresistance of antimony single crystals has been measured with the measuring current perpendicular and parallel to the magnetic field, respectively. Extremely large positive transverse magnetoresistance (TMR) up to 1,000,000% was obtained in a magnetic field of 7 T. Field dependence of TMR followed the power law MR ∝ H2a in all measured temperatures from 2 K to 300 K. The extremely large TMR is attributed to the well compensated electron and hole carriers with high mobility. A very pronounced negative longitudinal magnetoresistance (LMR) at high field and a valley at zero field was observed. The general behavior appears to be consistent with the chiral magneto effect predicted in quantum solids. Moreover, a very unusual negative potential from voltage leads was detected by IV curve, dc, and ac resistance measurements at high magnetic field. This observation cannot be understood in terms of available theories and may be related to some exotic topological characteristics predicted for antimony.
*The work performed at TcSUH is supported by US Air Force Office of Scientific Research Grant FA9550-15-1-0236, the T. L. L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at UH.
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Presenters
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Paul C. W. Chu
- Texas Center for Superconductivity, Univ of Houston
- Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
- Texas Center for Superconductivity, University of Houston
- Texas Center for Superconductivity and Department of Physics, University of Houston
- Texas Center for Superconductivity and Physics Department at the Univ of Houston