Evolution of critical pressure with increasing Fe substitution in the heavy-fermion system ${\text{URu}}_{2-x}{\text{Fe}}_{x}{\text{Si}}_{2}$
Measurements of electrical resistivity, ρ(T ), were performed under quasihydrostatic pressure up to P ~ 2.2 GPa to determine the pressure dependence of the so-called hidden order (HO) and large-moment antiferromagnetic (LMAFM) phases for the URu _{2-x}FexSi2 system with x = 0.025, 0.05, 0.10, 0.15, and 0.20. As the Fe concentration (x) is increased, we observed that a smaller amount of external pressure, P _{c}, is required to induce the HO → LMAFM phase transition. A critical pressure of P _{c} ~ 1.2 GPa at x = 0.025 reduces to P _{c} ~ 0 at x = 0.15, suggesting the URu _{2-x}Fe _{x}Si _{2} system is fully expressed in the LMAFM phase for x ≥ x* _{c} = 0.15, where x * _{ c} denotes the ambient pressure critical concentration of Fe. Furthermore, when using a bulk modulus calculation to convert x to chemical pressure, P _{ch}(x), we consistently found that the induced HO → LMAFM phase transition occurred at various combinations of x _{c} and P _{c} such that P _{ch}(x _{c}) + P _{c} ≈ 1.5 GPa, where xc denotes those critical concentrations of Fe that induce the HO→LMAFM phase transition for the URu _{2-x}Fe _{x}Si _{2} compoundsmore »
- Publication Date:
- Grant/Contract Number:
- NA0002909; FG02-04ER46105
- Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 94; Journal Issue: 8; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Research Org:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Org:
- USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
- OSTI Identifier:
- 1336814
- Alternate Identifier(s):
- OSTI ID: 1310833; OSTI ID: 1361432
Wolowiec, C. T., Kanchanavatee, N., Huang, K., Ran, S., and Maple, M. B.. Evolution of critical pressure with increasing Fe substitution in the heavy-fermion system URu2-xFexSi2. United States: N. p.,
Web. doi:10.1103/PhysRevB.94.085145.
Wolowiec, C. T., Kanchanavatee, N., Huang, K., Ran, S., & Maple, M. B.. Evolution of critical pressure with increasing Fe substitution in the heavy-fermion system URu2-xFexSi2. United States. doi:10.1103/PhysRevB.94.085145.
Wolowiec, C. T., Kanchanavatee, N., Huang, K., Ran, S., and Maple, M. B.. 2016.
"Evolution of critical pressure with increasing Fe substitution in the heavy-fermion system URu2-xFexSi2". United States.
doi:10.1103/PhysRevB.94.085145. https://www.osti.gov/servlets/purl/1336814.
@article{osti_1336814,
title = {Evolution of critical pressure with increasing Fe substitution in the heavy-fermion system URu2-xFexSi2},
author = {Wolowiec, C. T. and Kanchanavatee, N. and Huang, K. and Ran, S. and Maple, M. B.},
abstractNote = {Measurements of electrical resistivity, ρ(T ), were performed under quasihydrostatic pressure up to P ~ 2.2 GPa to determine the pressure dependence of the so-called hidden order (HO) and large-moment antiferromagnetic (LMAFM) phases for the URu2-xFexSi2 system with x = 0.025, 0.05, 0.10, 0.15, and 0.20. As the Fe concentration (x) is increased, we observed that a smaller amount of external pressure, Pc, is required to induce the HO → LMAFM phase transition. A critical pressure of Pc ~ 1.2 GPa at x = 0.025 reduces to Pc ~ 0 at x = 0.15, suggesting the URu2-xFexSi2 system is fully expressed in the LMAFM phase for x ≥ x*c = 0.15, where x * c denotes the ambient pressure critical concentration of Fe. Furthermore, when using a bulk modulus calculation to convert x to chemical pressure, Pch(x), we consistently found that the induced HO → LMAFM phase transition occurred at various combinations of xc and Pc such that Pch(xc) + Pc ≈ 1.5 GPa, where xc denotes those critical concentrations of Fe that induce the HO→LMAFM phase transition for the URu2-xFexSi2 compounds under pressure. We performed exponential fits of ρ(T ) in the HO and LMAFM phases in order to determine the pressure dependence of the energy gap, , that opens over part of the Fermi surface in the transition from the paramagnetic (PM) phase to the HO/LMAFM phase at the transition temperature, T0. Finally, this change in the pressure variation of Δ(P) at the HO→LMAFM phase transition is consistent with the values of Pc determined from the T0(P) phase lines at the PM→HO/LMAFM transition.},
doi = {10.1103/PhysRevB.94.085145},
journal = {Physical Review B},
number = 8,
volume = 94,
place = {United States},
year = {2016},
month = {8}
}