Publication

New spectroscopy solves an old puzzle: The Kondo scale in heavy fermions

Marco Grioni
2002
Journal Articles

Abstract

Resonant inelastic x-ray scattering (RIXS) yields clear evidence of spectroscopic Kondo scales in heavy fermions. In YbInCu4 and YbAgCu4 RIXS probes the Yb2+ component of the hybrid ground state and the temperature dependence of the Yb 4f occupation. We report a sudden valence change at a phase transition in YbInCu4 , but a continuous temperature dependence in YbAgCu4 , consistent with the predictions of the Anderson impurity model, for a Kondo temperature T-K=70 K . These results solve a long-standing controversy and establish RIXS as a quantitative probe of the electronic structure of strongly correlated electron systems.

Official source

https://infoscience.epfl.ch/entities/publication/3f1ab47c-7f32-42af-803e-79912847fb17

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Marco Grioni
2002
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/3f1ab47c-7f32-42af-803e-79912847fb17

About this result

Related concepts (32)

Strongly correlated material

Strongly correlated materials are a wide class of compounds that include insulators and electronic materials, and show unusual (often technologically useful) electronic and magnetic properties, such as metal-insulator transitions, heavy fermion behavior, half-metallicity, and spin-charge separation. The essential feature that defines these materials is that the behavior of their electrons or spinons cannot be described effectively in terms of non-interacting entities.

Phase transition

In chemistry, thermodynamics, and other related fields, a phase transition (or phase change) is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas, and in rare cases, plasma. A phase of a thermodynamic system and the states of matter have uniform physical properties. During a phase transition of a given medium, certain properties of the medium change as a result of the change of external conditions, such as temperature or pressure.

Dynamical mean-field theory

Dynamical mean-field theory (DMFT) is a method to determine the electronic structure of strongly correlated materials. In such materials, the approximation of independent electrons, which is used in density functional theory and usual band structure calculations, breaks down. Dynamical mean-field theory, a non-perturbative treatment of local interactions between electrons, bridges the gap between the nearly free electron gas limit and the atomic limit of condensed-matter physics.

Related publications (1)

New spectroscopy solves an old puzzle: The Kondo scale in heavy fermions

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