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

Published

February 26, 2015

Author(s)

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

Abstract

We have used specific heat and neutron diffraction measurements on single crystals of UR_2-xFe_xSi₂ for Fe concentrations X less than or equal to} 0.7 to establish that chemical substitution of Ru with Fe acts as "chemical pressure" P_ch 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 K_T =5.2x10^{-3 GPa} u-1^ for UrU₂Si₂, we determine the chemical pressure P_ch in URu_2-xFe_xSi₂ as a function of x. The resulting temperature T-chemical pressure P_ch phase diagram for URu_2-xFe_xSi₂ is in agreement with the established temperature T-external pressure P phase diagram of URu₂Si₂

Citation

Physical Review B

Volume

91

Issue

8

Pub Type

Journals

Download Paper

Local Download

Keywords

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

Citation

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 URu₂Si₂ via Isoelectronic Substitution of Ru with Fe, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=917753 (Accessed October 9, 2025)