Planar Hall effect and quasi-2D anisotropic superconductivity in topological candidate 1$T$-NbSeTe

Superconducting topological materials have generated considerable interest in condensed matter research due to their unusual gap structures and topological properties. In this study, we have investigated the normal and superconducting characteristics of a potential topological semimetal 1$T$-NbSeTe through comprehensive transport and magnetization measurements on bulk single crystals. The results suggest the topological semimetallic nature of NbSeTe, evidenced by the observation of the planar Hall effect. Moreover, it displays quasi-2D anisotropic superconductivity, which breaks the Pauli limit. The coexistence of the topological semimetallic nature and superconductivity in NbSeTe makes it a potential contender for topological superconductivity.