Probing the extended non-Fermi liquid regimes of MnSi and Fe
Pedrazzini
P
author
Jaccard
D
author
Lapertot
G
author
Flouquet
J
author
Inada
Y
author
Kohara
H
author
Onuki
Y
author
2006
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 p and around 2p. In order to determine the extension of their NFL regions, we analyze the evolution of the resistivity ρ(T)˜A(p)T at higher pressures. We find that in MnSi the n=32 exponent holds below 4.8GPa≈3p, but it increases above that pressure. At 7.2 GPa we observe the low-temperature Fermi liquid exponent n=2 whereas for T>1.5K, n=53. Our measurements in Fe show that the NFL behavior ρ˜T 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(30.5GPa)=0.23K, while the A—coefficient diminishes monotonically by around 50%.
electrical resistivity
Fermi liquid
ferromagnetic materials
high-pressure effects
iron
magnetic superconductors
manganese alloys
silicon alloys
strongly correlated electron systems
superconducting transition temperature
superconducting transitions
whiskers
MnSi
Fe
exported from refbase (http://fisica.cab.cnea.gov.ar/bt/refbase/show.php?record=469), last updated on Mon, 27 Apr 2009 16:03:36 -0300
text
10.1016/j.physb.2006.01.062
Pedrazzini_etal2006
Physica B – Condensed Matter
Physica B
2006
continuing
periodical
academic journal
378-380
165
166