High-temperature signatures of quantum criticality in heavy fermion systems

Details High-temperature signatures of quantum criticality in heavy fermion systems High-temperature signatures of quantum criticality in heavy fermion systems

2009-07-08

arxiv.org/abs/0907.1340v2

J. Phys.: Condens. Matter 22, 164203 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

Inveted paper, International Conference on Magnetism, ICM 2009, Karlsruhe. Published version, added discussions of the relevan

Scientific paper

10.1088/0953-8984/22/16/164203

We propose a new criterion for distinguishing the Hertz-Millis (HM) and the local quantum critical (LQC) mechanism in heavy fermion systems with a magnetic quantum phase transition (QPT). The criterion is based on our finding that the spin screening of Kondo ions can be completely suppressed by the RKKY coupling to the surrounding magnetic ions even without magnetic ordering and that, consequently, the signature of this suppression can be observed in spectroscopic measurements above the magnetic ordering temperature. We apply the criterion to high-resolution photoemission (UPS) measurements on CeCu$_{6-x}$Au$_{x}$ and conclude that the QPT in this system is dominated by the LQC scenario.

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