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Probing the extended non-Fermi liquid regimes of MnSi and Fe

Lapertot, G.
Flouquet, J.
Inada, Y.
Kohara, H.
Onuki, Y.
Published in Physica B: Condensed Matter. 2006, vol. 378-380, p. 165-166
Abstract 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 pcpc and around 2pc2pc. In order to determine the extension of their NFL regions, we analyze the evolution of the resistivity ρ(T)∼A(p)Tnρ(T)∼A(p)Tn at higher pressures. We find that in MnSi the View the MathML sourcen=32 exponent holds below View the MathML source4.8GPa≈3pc, but it increases above that pressure. At 7.2 GPa we observe the low-temperature Fermi liquid exponent n=2n=2 whereas for View the MathML sourceT>1.5K, View the MathML sourcen=53. Our measurements in Fe show that the NFL behavior ρ∼T5/3ρ∼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 View the MathML sourceTconset(30.5GPa)=0.23K, while the AA—coefficient diminishes monotonically by around 50%.
Keywords Non-Fermi liquidsUnconventional superconductivityFerromagnetismFeMnSi
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Research group Groupe Triscone
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PEDRAZZINI, Pablo et al. Probing the extended non-Fermi liquid regimes of MnSi and Fe. In: Physica B: Condensed Matter, 2006, vol. 378-380, p. 165-166. https://archive-ouverte.unige.ch/unige:35737

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Deposited on : 2014-04-15

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