Transition from intrinsic to extrinsic anomalous Hall effect in the ferromagnetic Weyl semimetal PrAlGe1-xSix

Yang, Hung-Yu; Singh, Bahadur; Lu, Baozhu; Huang, Cheng-Yi; Bahrami, Faranak; Chiu, Wei-Chi; Graf, David; Huang, Shin-Ming; Wang, Baokai; Lin, Hsin; Torchinsky, Darius; Bansil, Arun; Tafti, Fazel

doi:10.1063/1.5132958

Title: Transition from intrinsic to extrinsic anomalous Hall effect in the ferromagnetic Weyl semimetal PrAlGe_1-xSi_x

Journal Article · Thu Jan 16 00:00:00 EST 2020 · APL Materials

DOI:https://doi.org/10.1063/1.5132958· OSTI ID:1800447

^[1];

^[2]; Lu, Baozhu ^[3]; Huang, Cheng-Yi ^[4]; Bahrami, Faranak ^[1];

^[5]; Graf, David ^[6]; Huang, Shin-Ming ^[7]; Wang, Baokai ^[5]; Lin, Hsin ^[4]; Torchinsky, Darius ^[3]; Bansil, Arun ^[5];

^[1]

Boston College, Chestnut Hill, MA (United States). Dept. of Physics
Northeastern Univ., Boston, MA (United States). Dept. of Physics; Shenzhen Univ. (China)
Temple Univ., Philadelphia, PA (United States). Dept. of Physics and Temple Materials Institute
Academia Sinica, Taipei (Taiwan). Inst. of Physics
Northeastern Univ., Boston, MA (United States). Dept. of Physics
National High Magnetic Field Lab., Tallahassee, FL (United States)
National Sun Yat-sen Univ., Kaohsiung (Taiwan). Dept. of Physics

Recent reports of a large anomalous Hall effect (AHE) in ferromagnetic Weyl semimetals (FM WSMs) have led to a resurgence of interest in this enigmatic phenomenon. However, due to a lack of tunable materials, the interplay between the intrinsic mechanism caused by Berry curvature and extrinsic mechanisms due to scattering remains unclear in FM WSMs. In this contribution, we present a thorough investigation of both the extrinsic and intrinsic AHEs in a new family of FM WSMs, PrAlGe_1-xSi_x, where x can be tuned continuously. Based on the first-principles calculations, we show that the two end members, PrAlGe and PrAlSi, have different Fermi surfaces, but similar Weyl node structures. Experimentally, we observe moderate changes in the anomalous Hall coefficient (R_S), but significant changes in the ordinary Hall coefficient (R₀) in PrAlGe_1-xSi_x as a function of x. By comparing the magnitude of R₀ and R_S, we identify two regimes: |R₀| < |R_S| for x ≤ 0.5 and |R₀| > |R_S| for x > 0.5. Through a detailed scaling analysis, we uncover a universal anomalous Hall conductivity (AHC) from intrinsic contribution when x ≤ 0.5. Such a universal AHC is absent for x > 0.5. Our study, thus, reveals the significance of extrinsic mechanisms in FM WSMs and reports the first observation of the transition from the intrinsic to extrinsic AHE in PrAlGe_1-xSi_x.

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Research Organization:: Northeastern Univ., Boston, MA (United States); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-07ER46352; AC02-05CH11231; AC02- 05CH11231

OSTI ID:: 1800447

Alternate ID(s):: OSTI ID: 1591964

Journal Information:: APL Materials, Vol. 8, Issue 1; ISSN 2166-532X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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Title: Transition from intrinsic to extrinsic anomalous Hall effect in the ferromagnetic Weyl semimetal PrAlGe1-xSix

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Title: Transition from intrinsic to extrinsic anomalous Hall effect in the ferromagnetic Weyl semimetal PrAlGe_1-xSi_x