Actinide physics and materials science. Recent research includes investigations of anomalous martensitic mechanisms in plutonium alloys, exploration of pressure-dependent properties of heavy fermion superconductors and magnets, and the development of high-pressure techniques for broad research applications.
N. P. Butch, J. R. Jeffries, D. A. Zocco, and M. B. Maple (accepted), "Hydrostaticity and hidden order: implications for the temperature-pressure phase diagram of URu2Si2,"
J. R. Jeffries, K. J. M. Blobaum, M. A. Wall, and A. J. Schwartz (accepted), "Microstructural evidence for conditioning-dependent δ→α' transformations in retained δ-Pu,"
J. R. Jeffries, K. J. M. Blobaum, M. A. Wall, and A. J. Schwartz (in press), "Reproducible phase transformation in a single Pu-2.0 at.% Ga specimen,"
J. R. Jeffries, N. P. Butch, B. T. Yukich, and M. B. Maple, "The Evolution of the Ordered States of Single Crystal URu2Si2 under Pressure,"
J. R. Jeffries, N. P. Butch, B. T. Yukich, and M. B. Maple, "Competing Ordered Phases in URu2Si2: Hydrostatic Pressure and Rhenium Substitution,"