### 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 ) T^{n} 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 | |

Publication status | Published - May 1 2006 |

Externally published | Yes |

### Fingerprint

### Keywords

- Fe
- Ferromagnetism
- MnSi
- Non-Fermi liquids
- Unconventional superconductivity

### ASJC Scopus subject areas

- Materials Science(all)
- Condensed Matter Physics

### Cite this

*Physica B: Condensed Matter*,

*378-380*(SPEC. ISS.), 165-166. https://doi.org/10.1016/j.physb.2006.01.062

**Probing the extended non-Fermi liquid regimes of MnSi and Fe.** / Pedrazzini, P.; Jaccard, D.; Lapertot, G.; Flouquet, J.; Inada, Yoshihiko; Kohara, H.; Onuki, Y.

Research output: Contribution to journal › Article

*Physica B: Condensed Matter*, vol. 378-380, no. SPEC. ISS., pp. 165-166. https://doi.org/10.1016/j.physb.2006.01.062

}

TY - JOUR

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, Yoshihiko

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

UR - http://www.scopus.com/inward/record.url?scp=33747740092&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33747740092&partnerID=8YFLogxK

U2 - 10.1016/j.physb.2006.01.062

DO - 10.1016/j.physb.2006.01.062

M3 - Article

VL - 378-380

SP - 165

EP - 166

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

SN - 0921-4526

IS - SPEC. ISS.

ER -