Unraveling the structural dependency of Weyl nodes in Co2MnGa

Schulz, N.; Pantano, G.; DeTellem, D.; Chanda, A.; Clements, Eleanor M.; McGuire, Michael A.; Markou, A.; Felser, C.; Arena, D. A.; Gayles, J.; Phan, M. H.; Srikanth, H.

doi:10.1103/physrevb.110.054419

Unraveling the structural dependency of Weyl nodes in Co2 MnGa

Journal Article · Fri Aug 09 00:00:00 EDT 2024 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.110.054419· OSTI ID:2434346

^[1]; ^[1]; DeTellem, D. ^[1]; ^[1]; Clements, Eleanor M. ^[2]; ^[2]; ^[3]; ^[4]; Arena, D. A. ^[1]; Gayles, J. ^[1]; ^[1]; ^[1]

Univ. of South Florida, Tampa, FL (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of Ioannina (Greece)
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)

Conventionally, the modulation of the intrinsic Weyl nodes in Weyl semimetals is challenging, due to topological protection. Here we report the structural dependence of the Weyl nodes in a Co2⁢MnGa Heusler thin film via a temperature-dependent tetragonal distortion. The ability to manipulate these Weyl nodes allows for the control of the intrinsic electromagnetic properties. Temperature-dependent x-ray diffraction (XRD) measurements identify a compressive tetragonal distortion with decreasing temperature from 300 to 20 K. The calculated Weyl properties can be directly compared with experimental parameters through the temperature-dependent XRD measurements which show the intrinsic correlation between Weyl properties and important magnetic parameters. Further, the microscopic momentum space properties of Weyl nodes such as the distance (d_W), solid angle (Ω_W), tilt (φ_W), and nodal point energy (E_W) directly affect the macroscopic observable properties such as exchange stiffness (A), magnetization (M), and effective anisotropy field $$H^{eff}_{K}$$, as shown via structure-dependent density functional theory calculations. These predictions are experimentally observed as large variations in the bulk magnetization and effective anisotropy field as a function of temperature. These results highlight a unique degree of freedom in the control of macroscopic magnetic properties via the modulation of the intrinsic properties of Weyl nodes through structural distortions.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC05-00OR22725; FG02-07ER46438

OSTI ID:: 2434346

Alternate ID(s):: OSTI ID: 2473807

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 5 Vol. 110; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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