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Non-Fermi-liquid behavior within the ferromagnetic phase in URu2-xRexSi2
1Department of Physics and Institute For Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093, USA.
Physical Review Letters
|March 24, 2005
Summary
The URu2-xRexSi2 system shows ferromagnetic order and non-Fermi-liquid behavior, especially near its quantum critical point. This suggests a Griffiths-McCoy phase may explain the observed deviations from standard Fermi-liquid theory.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Critical Phenomena
Background:
- The URu2-xRexSi2 system is a well-studied heavy fermion material.
- Understanding deviations from Fermi-liquid behavior is crucial for heavy fermion systems.
Purpose of the Study:
- To investigate the interplay between ferromagnetism and non-Fermi-liquid behavior in URu2-xRexSi2.
- To determine the extent of non-Fermi-liquid behavior within the ferromagnetic phase.
- To explore the role of quantum criticality in these phenomena.
Main Methods:
- Measurements of specific heat (C/T) as a function of temperature.
- Measurements of electrical resistivity (ρ) as a function of temperature.
- Analysis of experimental data to identify non-Fermi-liquid scaling behaviors (e.g., -lnT, T(-0.1), T^n with n<2).
Main Results:
- Ferromagnetic order was observed for Re concentrations (x) between 0.3 and 1.0.
- Non-Fermi-liquid behavior, characterized by specific heat anomalies and power-law resistivity, was found for 0.15 ≤ x ≤ 0.6 and 0.15 ≤ x < 0.8, respectively.
- Evidence suggests non-Fermi-liquid behavior persists within the ferromagnetic phase.
Conclusions:
- The observed non-Fermi-liquid behavior within the ferromagnetic phase of URu2-xRexSi2 provides strong evidence for its persistence.
- Deviations from Fermi-liquid behavior are most pronounced at the ferromagnetic quantum critical point.
- The findings are consistent with the Griffiths-McCoy phase model, offering a potential explanation for the observed phenomena.
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