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Science 12 October 2001:
Vol. 294. no. 5541, pp. 315 - 316
DOI: 10.1126/science.1065115
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Perspectives

PHYSICS:
Quantum Criticality in a Clean Metal

Gabriel Aeppli and Yeong-Ah Soh

Classical phase transitions, which are driven by thermal vibrations, follow the concept of "universality": No matter how complex the system, its behavior near the phase transition should be largely governed by its spatial dimensionality. Quantum phase transitions are much more difficult to study. In their Perspective, Aeppli and Soh highlight the report by Grigera et al., who have succeeded in characterizing the quantum phase behavior of an unusually clean metal system. This and other studies are indicating that quantum phase transitions also follow a universal behavior.

The authors are at the NEC Research Institute, Princeton, NJ 08540, USA. E-mail: gabe{at}research.nj.nec.com

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Science. ISSN 0036-8075 (print), 1095-9203 (online)