Giant Hall effect in two-dimensional CoSi<sub>2</sub> granular arrays

ORAL

Abstract

Granular metals are essential in sensor and device applications and provide customizable electrical characteristics. We fabricated a series of nonmagnetic granular CoSi2 thin films and investigated their transport characteristics and Hall effect. In films that are just above the metal-insulator transition, we found that the Hall coefficient is enhanced by two orders of magnitude. The reduction of the charge carriers caused by the local quantum-interference effect is ascribed to this Giant Hall effect (GHE). Transmission electron microscopy images and transport measurements show that our films form quasi-two-dimensional granular arrays. The GHE may provide useful and sensitive applications.

*This work was supported by the National Science and Technology Council of Taiwan through grant numbers 110-2112-M-A49-015 and 111-2119-M-007-005 (J.J.L.), and 110-2112 M-A49-033 MY3 (S.S.Y.). S.S.Y. was partly supported by the Center for Emergent Functional Matter Science of NYCU from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education of Taiwan. The authors acknowledge the use of HRTEM at the Instrument Center of National Tsing Hua University (Taiwan).

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Publication: [1] Heredia E A, Chiu S P, Nguyen B A V, Wang R T, Wu C Y, Yeh S S and Lin J J 2024 Phys. Rev. B 110 024201

Presenters

  • Elica A Heredia

    • International College of Semiconductor Technology, National Yang Ming Chiao Tung University, Hsinchu 30010

Authors

  • Elica A Heredia

    • International College of Semiconductor Technology, National Yang Ming Chiao Tung University, Hsinchu 30010

  • Shao-Pin Chiu

    • Department of Physics, Fu Jen Catholic University, Taipei 24205

  • Ba-Anh-Vu Nguyen

    • Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010

  • Ruey-Tay Wang

    • Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010

  • Chih-Yuan Wu

    • Department of Physics, Fu Jen Catholic University, Taipei 24205

  • Sheng-Shiuan Yeh

    • International College of Semiconductor Technology, National Yang Ming Chiao Tung University, Hsinchu 30010
    • International College of Semiconductor Technology, National Yang Ming Chiao Tung University

  • Juhn-Jong Lin

    • Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010