| Issue |
Europhys. Lett.
Volume 71, Number 5, September 2005
|
|
|---|---|---|
| Page(s) | 790 - 796 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2005-10138-7 | |
| Published online | 22 July 2005 | |
Quantum Griffiths effects in metallic systems
1
Department of Physics, Boston University - Boston, MA 02215, USA
2
IBM Almaden Research Center - San Jose, CA 95120-6090, USA
Received:
2
May
2005
Accepted:
27
June
2005
We show that two apparently contradictory theories on the
existence of Griffiths-McCoy singularities in magnetic metallic
systems (see Castro Neto A. H. and Jones B. A.,
Phys. Rev. B 62 (2000) 14975 and Millis A. J.,
Morr D. and Schmalian J., Phys. Rev.
B 66 (2002) 174433) are in fact mathematically equivalent. We
discuss the generic phase diagram of the problem and show that
there is a non-universal crossover temperature range
where power law behavior (Griffiths-McCoy
behavior) is expected. For 
power law behavior ceases to
exist due to the destruction of quantum effects generated by the
dissipation in the metallic environment. We show that T* is an
analogue of the Kondo temperature and is controlled by
non-universal couplings.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 75.20.-g – Diamagnetism, paramagnetism, and superparamagnetism / 75.40.-s – Critical-point effects, specific heats, short-range order
© EDP Sciences, 2005
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