High Pressure Studies of CeIn$_{3}$ in High Magnetic Fields*

High pressure and strong magnetic fields are useful tools for studying the relationship between the antiferromagnetism and unconventional superconductivity observed in the heavy fermion superconductor CeIn$_{3}$.$^{1,2}$ We report high pulsed magnetic field (up to 55 T) pressure studies of single crystal CeIn$_{3}$ utilizing the change in the resonant frequency of a tunnel diode oscillator (TDO) as a contactless means of measuring the skin depth of the crystal. An anomaly in the skin depth was observed at $\sim $42 T and was found to be driven to lower fields with increasing pressure. The relationship of the observed anomaly with the nature of the Fermi surface and the formation of a superconducting state at $\sim $200 mK and 27 kbar will be discussed. 1. N. Harrison et al, preprint arXiv:07062387 2. N. D. Mathur et al, Nature, 394, 39 (1998)