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Metals containing Ce often show strong electron correlations due to theproximity of the 4f state to the Fermi energy, leading to strong coupling withthe conduction electrons. This coupling typically induces a variety ofcompeting ground states, including heavy-fermion metals, magnetism andunconventional superconductivity. The d-wave superconductivity in CeTMIn5(TM=Co, Rh, Ir) has attracted significant interest due to its qualitativesimilarity to the cuprate high-Tc superconductors. Here, we show evidence for afield induced phase-transition to a state akin to a density-wave (DW) in theheavy fermion CeRhIn5, existing in proximity to its unconventionalsuperconductivity. The DW state is signaled by a hysteretic anomaly in thein-plane resistivity accompanied by the appearance of non-linear electricaltransport at high magnetic fields (>27T), which are the distinctivecharacteristics of density-wave states. The unusually large hysteresis enablesus to directly investigate the Fermi surface of a supercooled electronic systemand to clearly associate a Fermi surface reconstruction with the transition.Key to our observation is the fabrication of single crystal microstructures,which are found to be highly sensitive to "subtle" phase transitions involvingonly small portions of the Fermi surface. Such subtle order might be a commonfeature among correlated electron systems, and its clear observation adds a newperspective on the similarly subtle CDW state in the cuprates.

Field induced density wave in the heavy fermion compound CeRhIn5