Tuning of physical properties through chemical intercalation in two dimensional Fe_xNbTe₂

The layered materials with weak van der Waals interlayer interaction have created a rich platform to exhibit exotic properties such as charge density wave (CDW), topological properties, 2D magnetism, and superconductivity. NbTe₂ is a layered materials with the same structure as 1T’ WTe₂ phase. It has a CDW transition above 550K, and meanwhile exhibits superconducting transition below 0.74K. By intercalation of magnetic iron atoms, we are expecting to observe the interplay among superconductivity, CDW and magnetism in this NbTe₂ system. Indeed, through manipulation of the synthetic conditions, we observed drastic changes of crystal symmetry and physical properties in the same material Fe_xNbTe₂ with ground state from spin glass insulator to antiferromagnetic metal down to 2K, with more exotic magnetoresistivity and Hall behavior observed. The details of these results will be presented and the interplay of multiple orders in this system will be further elaborated.