Signature of quantum criticality in photoemission spectroscopy at elevated temperature

Details Signature of quantum criticality in photoemission spectroscopy at elevated temperature Signature of quantum criticality in photoemission spectroscopy at elevated temperature

2008-06-19

arxiv.org/abs/0806.3296v3

Phys. Rev. Lett 101, 266404 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Published version, PRL, minor changes in wording

Scientific paper

10.1103/PhysRevLett.101.266404

A quantum phase transition (QPT) in a heavy-fermion (HF) compound may destroy the Fermi liquid groundstate. However, the conditions for this breakdown have remained obscure. We report the first direct investigation of heavy quasiparticle formation and breakdown in the canonical system CeCu$_{6-x}$Au$_x$ by ultraviolet photoemission spectroscopy at elevated temperatures without the complications of lattice coherence. Surprisingly, the single-ion Kondo energy scale $T_K$ exhibits an abrupt step near the quantum critical Au concentration of $x_c=0.1$. We show theoretically that this step is expected from a highly non-linear renormalization of the local spin coupling at each Ce site, induced by spin fluctuations on neighboring sites. It provides a general high-temperature indicator for HF quasiparticle breakdown at a QPT.

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