Electronic structure and magnetic and transport properties of antiferromagnetic Weyl semimetal GdAlSi

Laha, Antu; Kundu, Asish K.; Aryal, Niraj; Bozin, Emil S.; Yao, Juntao; Paone, Sarah; Rajapitamahuni, Anil; Vescovo, Elio; Valla, Tonica; Abeykoon, Milinda; Jing, Ran; Yin, Weiguo; Pasupathy, Abhay N.; Liu, Mengkun; Li, Qiang

doi:10.1103/physrevb.109.035120

Electronic structure and magnetic and transport properties of antiferromagnetic Weyl semimetal GdAlSi

Journal Article · Thu Jan 11 00:00:00 EST 2024 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.109.035120· OSTI ID:2338116

^[1]; ^[2]; Aryal, Niraj ^[2]; ^[2]; Yao, Juntao ^[2]; Paone, Sarah ^[1]; Rajapitamahuni, Anil ^[3]; Vescovo, Elio ^[3]; Valla, Tonica ^[4]; Abeykoon, Milinda ^[3]; Jing, Ran ^[2]; ^[2]; Pasupathy, Abhay N. ^[5]; Liu, Mengkun ^[6]; ^[1]

Stony Brook University, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Donostia International Physics Center, Donostia-San Sebastian (Spain)
Brookhaven National Laboratory (BNL), Upton, NY (United States); Columbia University, New York, NY (United States)
Stony Brook University, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Here we report the topological electronic structure, magnetic, and magnetotransport properties of a noncentrosymmetric compound GdAlSi. Magnetic susceptibility shows an antiferromagnetic transition at TN = 32 K. In-plane isothermal magnetization exhibits an unusual hysteresis behavior at higher magnetic field, rather than near zero field. Moreover, the hysteresis behavior is asymmetric under positive and negative magnetic fields. First-principles calculations were performed on various magnetic configurations, revealing that the antiferromagnetic state is the ground state, and the spiral antiferromagnetic state is a close competing state. The calculations also reveal that GdAlSi hosts multiple Weyl points near the Fermi energy. The band structure measured by angle-resolved photoemission spectroscopy (ARPES) shows relatively good agreement with the theory, with the possibility of Weyl nodes slightly above the Fermi energy. Within the magnetic ordered state, we observe an exceptionally large anomalous Hall conductivity (AHC) of ~ 1310 Ω-1cm-1 at 2 K. Interestingly, the anomalous Hall effect persists up to room temperature with a significant value of AHC (~ 155 Ω-1cm-1). Our analysis indicates that the large AHC originates from the Berry curvature associated with the multiple pairs of Weyl points near Fermi energy.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

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

Grant/Contract Number:: SC0012704

OSTI ID:: 2338116

Alternate ID(s):: OSTI ID: 2473396

Report Number(s):: BNL--225513-2024-JAAM

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 3 Vol. 109; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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