Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-11-29
Physics
Condensed Matter
Strongly Correlated Electrons
2 pages
Scientific paper
10.1209/epl/i2005-10345-2
In a recent paper Castro-Neto and Jones argue that because the observability of quantum Griffiths-McCoy effects in metals is controlled by non-universal quantities, the quantum Griffiths-McCoy scenario may be a viable explanation for the non-fermi-liquid behavior observed in heavy fermion compounds. In this Comment we point out that the important non-universal quantity is the damping of the spin dynamics by the metallic electrons; quantum Griffiths-McCoy effects occur only if this is parametrically weak relative to other scales in the problem, i.e. if the spins are decoupled from the carriers. This suggests that in heavy fermion materials, where the Kondo effect leads to a strong carrier-spin coupling, quantum Griffiths-McCoy effects are unlikely to occur.
Millis Andrew. J.
Morr Dirk. K.
Schmalian Joerg
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