de-Haas–van Alphen effect in superconductingV3Si

Quantum oscillations in the magnetization, periodic in inverse field (de Haas–van Alphen effect), have been observed in ${\mathrm{V}}_3$Si both above as well as below the superconducting critical field ${\mathit{B}}_{\mathit{c}2}$ of 17.95 T for fields along the [100] direction and at 1.5 K. The oscillations have the same frequency (±0.3%) in the two field regimes. It is shown by intercomparing the amplitudes that quantum oscillation measurements can be used to determine the field density distribution in the superconducting phase.