P*

Zr₂Te₂P was recently introduced as a strong topological metal with multiple Dirac cones [1], but it remains an open question as to whether the bulk metallic states and topologically protected states together can produce novel behavior. To explore this, we examined the chemical substitution series Zr₂(Te_1-xSe_x)₂P. A combination of XRD and EDS show that (1) the crystals form in the expected structure and (2) the unit cell volume is compressed as Te → Se. In order to follow the impact on the Fermi surface, electrical transport and torque magnetometry measurements were performed over a temperature range of 500mK–50K, in magnetic fields μ₀ H<41T. These measurements reveal (1) a complex evolution of the Fermi surface topography and (2) that the effective masses for some branches decrease with increasing x. We will discuss these results and the prospects for understanding the interplay between conventional and topological states and for inducing other ordered states, such as superconductivity. [1] K.-W. Chen, et. al. PRB 97, 165112 (2018)