IndiumV3, Main, Repository, bibRecord, 011992

Bulk electronic structure of YbInCu4 from photoemission: A unique test of the single impurity model

Identifieur interne : 011992 ( Main/Repository ); précédent : 011991; suivant : 011993

Bulk electronic structure of YbInCu4 from photoemission: A unique test of the single impurity model

Auteurs : RBID : Pascal:01-0020309

Descripteurs français

Pascal (Inist)
- 7127, 7128, 7120L, Etude expérimentale, Ytterbium alliage, Indium alliage, Cuivre alliage, Spectre photoélectron, Système fermions lourds, Etat impureté, Effet Kondo.

English descriptors

KwdEn :
- Copper alloys, Experimental study, Heavy fermion systems, Impurity states, Indium alloys, Kondo effect, Photoelectron spectra, Ytterbium alloys.

Abstract

The heavy fermion compound YbInCu₄ presents a unique opportunity to test the single impurity model (SIM) owing to its isostructural phase transition at 42 K, whereby the Kondo temperature suddenly increases from 30 K above, to 400 K below the transition. Photoelectron spectroscopy (PES) at varying temperatures is well suited for this test. Previous researchers have claimed that PES probes only a subsurface region which differs from the bulk, thus rendering PES less than optimum for such a test. We present PES data in which a single-crystal sample was cooled through the phase transition only once in order to minimize defect formation. We find clear evidence of the bulk transition and no evidence for a subsurface region. The PES spectra do not agree with the predictions of the SIM and its approximate solution, the noncrossing approximation. We propose that only a periodic model is applicable to highly correlated, stoichiometric heavy fermion systems.

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Pascal:01-0020309

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<front><div type="abstract" xml:lang="en">The heavy fermion compound YbInCu<sub>4</sub>
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Bulk electronic structure of YbInCu4 from photoemission: A unique test of the single impurity model

Bulk electronic structure of YbInCu4 from photoemission: A unique test of the single impurity model

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