Evolution of critical pressure with increasing Fe substitution in the heavy-fermion system
Journal Article
·
· Physical Review B
- Univ. of California, San Diego, CA (United States); University of California, San Diego
- Univ. of California, San Diego, CA (United States)
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.
- Research Organization:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- FG02-04ER46105; NA0002909
- OSTI ID:
- 1336814
- Alternate ID(s):
- OSTI ID: 1310833
OSTI ID: 1361432
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 8 Vol. 94; ISSN 2469-9950; ISSN PRBMDO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Hidden order and beyond: an experimental—theoretical overview of the multifaceted behavior of URu 2 Si 2
|
journal | January 2020 |
Distinct magnetic spectra in the hidden order and antiferromagnetic phases in URu 2 − x Fe x Si 2
|
journal | November 2016 |
Similar Records
Quasiparticle relaxation dynamics in single crystals
Chemical pressure tuning of via isoelectronic substitution of Ru with Fe
Journal Article
·
Sun Apr 28 20:00:00 EDT 2019
· Physical Review B
·
OSTI ID:1609541
Chemical pressure tuning of via isoelectronic substitution of Ru with Fe
Journal Article
·
Wed Feb 25 19:00:00 EST 2015
· Physical Review. B, Condensed Matter and Materials Physics
·
OSTI ID:1193437