IndiumV3, Russie, Analysis, bibRecord, 000274

Asymmetrical tunneling in heavy fermion metals as a possible probe for their non-Fermi liquid peculiarities

Identifieur interne : 000274 ( Russie/Analysis ); précédent : 000273; suivant : 000275

Asymmetrical tunneling in heavy fermion metals as a possible probe for their non-Fermi liquid peculiarities

Auteurs : RBID : Pascal:07-0368585

Descripteurs français

Pascal (Inist)
- Effet tunnel, Liquide non Fermi, Spectrométrie contact ponctuel, Conductivité électrique, Théorie Landau, Liquide Fermi, Transition phase quantique, Spectre excitation, Asymétrie, Quasiparticule, Fermion lourd, Cérium alliage, Cobalt alliage, Indium alliage, CeCoIn5, 7215Q.

English descriptors

KwdEn :
- Asymmetry, Cerium alloys, Cobalt alloys, Electrical conductivity, Excitation spectrum, Fermi liquid, Heavy fermions, Indium alloys, Landau theory, Non Fermi liquid, Point contact spectroscopy, Quantum phase transition, Quasiparticles, Tunnel effect.

Abstract

Tunneling conductivity and point contact spectroscopy between heavy fermion metal and a simple metallic point contact may serve as a convenient probing tool for non-Fermi liquid behavior. Landau Fermi liquid theory predicts that the differential conductivity is a symmetric function of voltage bias. This symmetry, in fact, holds if so called particle-hole symmetry is preserved. Here, we show that the situation can be different when one of the two metals is a heavy fermion one whose electronic system is a heavy fermion liquid. When the heavy fermion liquid undergoes fermion condensation quantum phase transition, the particle-hole symmetry in the excitation spectra is violated making both the differential tunneling conductivity and dynamic conductance asymmetric as a function of applied voltage. This asymmetry can be observed when the heavy fermion metal is either normal or superconducting. We discuss also the possible experiments to study the above asymmetry and note that asymmetric conductivity has been recently observed in measurements on CeCoIn₅.

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Le document en format XML

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<author><name sortKey="Shaginyan, V R" uniqKey="Shaginyan V">V. R. Shaginyan</name>
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<author><name sortKey="Stephanovich, V A" uniqKey="Stephanovich V">V. A. Stephanovich</name>
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<author><name sortKey="Kirichenko, E V" uniqKey="Kirichenko E">E. V. Kirichenko</name>
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<term>Excitation spectrum</term>
<term>Fermi liquid</term>
<term>Heavy fermions</term>
<term>Indium alloys</term>
<term>Landau theory</term>
<term>Non Fermi liquid</term>
<term>Point contact spectroscopy</term>
<term>Quantum phase transition</term>
<term>Quasiparticles</term>
<term>Tunnel effect</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Effet tunnel</term>
<term>Liquide non Fermi</term>
<term>Spectrométrie contact ponctuel</term>
<term>Conductivité électrique</term>
<term>Théorie Landau</term>
<term>Liquide Fermi</term>
<term>Transition phase quantique</term>
<term>Spectre excitation</term>
<term>Asymétrie</term>
<term>Quasiparticule</term>
<term>Fermion lourd</term>
<term>Cérium alliage</term>
<term>Cobalt alliage</term>
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<front><div type="abstract" xml:lang="en">Tunneling conductivity and point contact spectroscopy between heavy fermion metal and a simple metallic point contact may serve as a convenient probing tool for non-Fermi liquid behavior. Landau Fermi liquid theory predicts that the differential conductivity is a symmetric function of voltage bias. This symmetry, in fact, holds if so called particle-hole symmetry is preserved. Here, we show that the situation can be different when one of the two metals is a heavy fermion one whose electronic system is a heavy fermion liquid. When the heavy fermion liquid undergoes fermion condensation quantum phase transition, the particle-hole symmetry in the excitation spectra is violated making both the differential tunneling conductivity and dynamic conductance asymmetric as a function of applied voltage. This asymmetry can be observed when the heavy fermion metal is either normal or superconducting. We discuss also the possible experiments to study the above asymmetry and note that asymmetric conductivity has been recently observed in measurements on CeCoIn<sub>5</sub>
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<fC01 i1="01" l="ENG"><s0>Tunneling conductivity and point contact spectroscopy between heavy fermion metal and a simple metallic point contact may serve as a convenient probing tool for non-Fermi liquid behavior. Landau Fermi liquid theory predicts that the differential conductivity is a symmetric function of voltage bias. This symmetry, in fact, holds if so called particle-hole symmetry is preserved. Here, we show that the situation can be different when one of the two metals is a heavy fermion one whose electronic system is a heavy fermion liquid. When the heavy fermion liquid undergoes fermion condensation quantum phase transition, the particle-hole symmetry in the excitation spectra is violated making both the differential tunneling conductivity and dynamic conductance asymmetric as a function of applied voltage. This asymmetry can be observed when the heavy fermion metal is either normal or superconducting. We discuss also the possible experiments to study the above asymmetry and note that asymmetric conductivity has been recently observed in measurements on CeCoIn<sub>5</sub>
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Asymmetrical tunneling in heavy fermion metals as a possible probe for their non-Fermi liquid peculiarities

Asymmetrical tunneling in heavy fermion metals as a possible probe for their non-Fermi liquid peculiarities

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri