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

P. Pedrazzini; D. Jaccard; G. Lapertot; J. Flouquet; Y. Inada; H. Kohara; Y. Onuki

doi:10.1016/j.physb.2006.01.062

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

P. Pedrazzini, D. Jaccard, G. Lapertot, J. Flouquet, Y. Inada, H. Kohara, Y. Onuki

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

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 p_c and around 2 p_c. 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 p_c, 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 ∼ T^{5 / 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 T_c^onset ( 30.5 GPa ) = 0.23 K, while the A-coefficient diminishes monotonically by around 50%.

Original language	English
Pages (from-to)	165-166
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	378-380
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physb.2006.01.062
Publication status	Published - May 1 2006
Externally published	Yes

Keywords

Fe
Ferromagnetism
MnSi
Non-Fermi liquids
Unconventional superconductivity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/j.physb.2006.01.062

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title = "Probing the extended non-Fermi liquid regimes of MnSi and Fe",

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 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%.",

keywords = "Fe, Ferromagnetism, MnSi, Non-Fermi liquids, Unconventional superconductivity",

author = "P. Pedrazzini and D. Jaccard and G. Lapertot and J. Flouquet and Y. Inada and H. Kohara and Y. Onuki",

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T1 - Probing the extended non-Fermi liquid regimes of MnSi and Fe

AU - Pedrazzini, P.

AU - Jaccard, D.

AU - Lapertot, G.

AU - Flouquet, J.

AU - Inada, Y.

AU - Kohara, H.

AU - Onuki, Y.

PY - 2006/5/1

Y1 - 2006/5/1

N2 - 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%.

AB - 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%.

KW - Fe

KW - Ferromagnetism

KW - MnSi

KW - Non-Fermi liquids

KW - Unconventional superconductivity

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

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Keywords

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