Pressure tuning of competing magnetic interactions in intermetallic CeFe_2

TitlePressure tuning of competing magnetic interactions in intermetallic CeFe_2
Publication TypeJournal Article
Year of Publication2012
AuthorsWang, J, Feng, Y, Jaramillo, R, Van Wezel, J, Canfield, PC, Rosenbaum, TF
JournalPhysical Review B
Date Published2012/07/20/
KeywordsAntiferromagnetism, CeM2, Chemical Doping, Crystallography, Diamond Anvil Cell, Ferromagnetism, Magnetic X-Ray Scattering, Pressure, Quantum Phase Transitions, X-Ray Scattering

We use high-pressure magnetic x-ray diffraction and numerical simulation to determine the low-temperature magnetic phase diagram of stoichiometric CeFe2. Near 1.5 GPa we find a transition from ferromagnetism to antiferromagnetism, accompanied by a rhombohedral distortion of the cubic Laves crystal lattice. By comparing pressure and chemical substitution we find that the phase transition is controlled by a shift of magnetic frustration from the Ce-Ce to the Fe-Fe sublattice. Notably the dominant Ce-Fe magnetic interaction, which sets the temperature scale for the onset of long-range order, remains satisfied throughout the phase diagram but does not determine the magnetic ground state. Our results illustrate the complexity of a system with multiple competing magnetic energy scales and lead to a general model for magnetism in cubic Laves phase intermetallic compounds.

Short TitlePhys. Rev. B