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Science 12 October 2001:
Vol. 294. no. 5541, p. 261
DOI: 10.1126/science.294.5541.261c
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This Week in Science
Quantum criticality, where a phase transition can be induced in the limit of zero temperature by application of external parameter (such as pressure, electric fields, or chemical substitution) has proven fruitful ground for experimental and theoretical investigation of correlated systems. However, the parameters used to tune these systems can create problems of their own, such as restricting the dimensionality of the system or introducing disorder that may mask some of the more interesting properties. Grigera et al. (p. 329; see the Perspective by Aeppli and Soh) present magneto-transport data on the ruthenate Sr3Ru3O7 that reveal the existence of a well-defined, magnetically tuned quantum critical point. A closer examination of the temperature dependence of this transition reveals behavior that is not readily explained by the current understanding of quantum criticality.
CREDIT: GRIGERA ET AL.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
