Kondo breakdown versus spin-density-wave criticality in heavy-fermion metals · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title
Kondo breakdown versus spin-density-wave criticality in heavy-fermion metals
Plain
At a heavy-fermion quantum critical point either magnetism appears while the f electrons stay bound to conduction electrons, or the binding itself (Kondo screening) breaks down; which happens decides the theory.
Precise · changed · core
Revision 1: For heavy-fermion quantum critical points (CeCu6-xAux, YbRh2Si2, CeRhIn5 under pressure, CeCoIn5), determine whether criticality is of Hertz-Millis-Moriya spin-density-wave type with Kondo screening intact, or of local (Kondo breakdown) type in which the f electrons leave the Fermi volume at the critical point. An answer classifies the known materials using $\omega/T$ scaling of the dynamical spin susceptibility, the Fermi-volume change, and the exponents of $C/T$ and $\rho(T)$.
Revision 2: For heavy-fermion quantum critical points (CeCu6-xAux, $\mathrm{YbRh_2Si_2}$, $\mathrm{CeRhIn_5}$ under pressure, $\mathrm{CeCoIn_5}$), determine whether criticality is of Hertz-Millis-Moriya spin-density-wave type with Kondo screening intact, or of local (Kondo breakdown) type in which the f electrons leave the Fermi volume at the critical point. An answer classifies the known materials using $\omega/T$ scaling of the dynamical spin susceptibility, the Fermi-volume change, and the exponents of $C/T$ and $\rho(T)$.
Settled by
Material-by-material measurements of Fermi volume on both sides of the critical point plus dynamical spin susceptibility scaling, compared with the two theories.
Kind
phenomenon
Answer type
classification
References
(empty)
Literature status
contested
Status note
(empty)
Posed since
2001

Decisions