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Chemical Pressure Tuning of URu2Si2 via Isoelectronic Substitution of Ru with Fe



Pinaki Das, N. Kanchanavatee, Joel Helton, K. Huang, R. E. Baumbach, E. D. Bauer, B. D. White, V. W. Burnett, M. B. Maple, Jeffrey W. Lynn, M. Janoschek


We have used specific heat and neutron diffraction measurements on single crystals of UR2-xFexSi2 for Fe concentrations X less than or equal to} 0.7 to establish that chemical substitution of Ru with Fe acts as "chemical pressure" Pch as previously proposed by Kanchanavatee et al. [Phys. Rev. B 84, 245122 (2011) based on bulk measurements on polycrystalline samples. Notable, neutron diffraction reveals a sharp increase of the uranium magnetic moment at x = 0.1, reminiscent of the behavior at the "hidden order" (HO) to large moment antiferromagnetic (LMAFM) phase transition observed a pressure Px approximately equal}0.5-037 GPa in URu2Si2. Using the unit cell volume determined from our measurements and an isothermal compressibility KT =5.2x10-3 GPa u-1^ for UrU2Si2, we determine the chemical pressure Pch in URu2-xFexSi2 as a function of x. The resulting temperature T-chemical pressure Pch phase diagram for URu2-xFexSi2 is in agreement with the established temperature T-external pressure P phase diagram of URu2Si2
Physical Review B


Heavy Fermion, Hidden Order, Neutron Diffraction, Specific heat, Phase Diagram, Chemical Pressure


Das, P. , Kanchanavatee, N. , Helton, J. , Huang, K. , Baumbach, R. , Bauer, E. , White, B. , Burnett, V. , Maple, M. , Lynn, J. and Janoschek, M. (2015), Chemical Pressure Tuning of URu<sub>2</sub>Si<sub>2</sub> via Isoelectronic Substitution of Ru with Fe, Physical Review B, [online], (Accessed July 21, 2024)


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Created February 25, 2015, Updated October 12, 2021