O7 by torque magnetometry

Cd₂Re₂O₇ is the first superconductor in pyrochlore oxide family and a prototype compound for spontaneous inversion symmetry breaking with strong spin-orbit coupling. The inversion breaking transition near 200K from centrosymmetric cubic phase to the noncentrosymmetric tetragonal phase. Another structural transition occurs at 120K. However, the distortions are very small and identified controversially in different measurement techniques. Quantum oscillation is very sensitive to the differences of the structures and ideally to study the inversion symmetry breaking from spin splitting Fermi surfaces. In this talk, we will discuss the Fermiology of Cd₂Re₂O₇ by torque magnetometry and compare with the density functional calculations.