Recent studies show that the non-Fermi liquid (NFL) behavior of MnSi and Fe spans over an unexpectedly broad pressure range, between the critical pressure pc and around 2 pc. In order to determine the extension of their NFL regions, we analyze the evolution of the resistivity ρ ( T ) ∼ A ( p ) Tn at higher pressures. We find that in MnSi the n = frac(3, 2) exponent holds below 4.8 GPa ≈ 3 pc, but it increases above that pressure. At 7.2 GPa we observe the low-temperature Fermi liquid exponent n = 2 whereas for T > 1.5 K, n = frac(5, 3). Our measurements in Fe show that the NFL behavior ρ ∼ T5 / 3 extends at least up to 30.5 GPa, above the entire superconducting (SC) region. In the studied pressure range, the onset of the SC transition reduces by a factor 10 down to Tconset ( 30.5 GPa ) = 0.23 K, while the A-coefficient diminishes monotonically by around 50%.
- Non-Fermi liquids
- Unconventional superconductivity
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering