Anomalous transverse effects in nodal line compounds Co[formula omitted]TaX (X = Al, Ga).

The magnetic ground state, electronic, and elastic properties of Co 2 TaX (X = Al, Ga) are investigated using Density functional theory calculations. The compounds are found to possess mechanical and dynamical stability. Both the compounds exhibit nodal line features in the majority spin channel without the inclusion of spin-orbit coupling (SOC) and become gapped lines when SOC is added. The anomalous Hall effect and anomalous Nernst effect caused by Berry curvature are investigated. Within the region of ± 300 m e V around Fermi level, the maximum values of anomalous Hall conductivities (AHC) are −602.8 S / cm and −593.8 S / cm , while anomalous Nernst conductivities (ANC) are -4.989 Am − 1 K − 1 and 4.934 Am − 1 K − 1 respectively, for Co 2 TaX (X = Al, Ga) compounds. Through the Heisenberg magnetic exchange interactions, the Curie temperatures (T C) for both Co 2 TaX (X = Al, Ga) compounds are calculated to be 560.7 K and 556.3 K within the mean-field approximation (MFA). The magneto-optical response is also examined, and the polar Kerr rotation angles for Co 2 TaAl and Co 2 TaGa at normal incidence were determined to be 0.11 ° and 1.35 ° , respectively. As a result, this study may pave the way for precise property engineering in real-world applications. • The compounds Co 2 TaX (X = Al, Ga) are found to be mechanically and dynamically stable. Both the compounds have nodal line characteristics in the majority spin channel without the inclusion of spin-orbit coupling, and when SOC is added, they become gapped lines. • The intrinsic anomalous Hall and Nernst conductivities are investigated around the Fermi level. • The Curie temperature (T C) is estimated through the Heisenberg magnetic exchange interactions within the mean-field approximation. • Additionally, the magneto-optical response for polar Kerr rotation angle at normal incidence is studied. [ABSTRACT FROM AUTHOR]