Chemical pressure tuning of URu${}_2$Si${}_2$ via isoelectronic substitution of Ru with Fe

Abstract

We have used specific heat and neutron diffraction measurements on single crystals of URu${}_{2-x}$Fe${}_x$Si${}_2$ for Fe concentrations $x$ $\le$ 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 {\bf 84}, 245122 (2011)] based on bulk measurements on polycrystalline samples. Notably, 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 at a pressure $P_x\approx$ 0.5-0.7~GPa in URu${}_2$Si${}_2$. Using the unit cell volume determined from our measurements and an isothermal compressibility ${\kappa }_T=5.2\times 10^{-3}$ GPa${}^{-1}$ for URu${}_2$Si${}_2$, we determine the chemical pressure $P_{ch}$ in URu${}_{2-x}$Fe${}_x$Si${}_2$ as a function of $x$. The resulting temperature $T$-chemical pressure $P_{ch}$ phase diagram for URu${}_{2-x}$Fe${}_x$Si${}_2$ is in agreement with the established temperature $T$-external pressure $P$ phase diagram of URu${}_2$Si${}_2$.

7 pages, 3 figures

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• Pressure-Induced Rotational Symmetry Breaking in URu${}_2$Si${}_2$
• Distinct magnetic spectra in the hidden order and antiferromagnetic phases in URu2-xFexSi2
• Electronic properties of a heavy-fermion U(Ru0.92Rh0.08)2Si2 single crystal
• NMR Investigation of antiferromagnetism and coherence in URu${}_2$Si${}_{2-x}$P${}_x$
• Quasiparticle Relaxation Dynamics in URu${}_{2-x}$Fe${}_x$Si${}_2$ Single Crystals
• Field-induced phases in a heavy-fermion U(Ru${}_{0.92}$Rh${}_{0.08}$)${}_2$Si${}_2$ single crystal