Tuning Fork measurement on spin-orbit coupled metal

Spin-orbit-coupled metal Cd₂Re₂O₇ has revealed several interesting phenomena, including the multipolar order and superconductivity. To understand these phenomena, the Landau Level quantization and quantum oscillation are essential. However, the early quantum oscillation pattern observed in torque magnetometry missed small orbits expected from the band structure calculation. To solve the problem, we applied tuning-fork-based torque differential magnetometry to search for the quantum oscillation patterns of the small Fermi Surface orbits in Cd₂Re₂O_7. The torque differential magnetometry measures the derivative of the magnetic torque relative to the magnetic field tilt angles, thus becoming very sensitive to the anisotropy of Fermi Surfaces. We will also compare the resolved orbital sizes with those determined from torque magnetometry.