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Science 12 November 2004:
Vol. 306. no. 5699, pp. 1154 - 1157
DOI: 10.1126/science.1104306
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Reports

Disorder-Sensitive Phase Formation Linked to Metamagnetic Quantum Criticality

S. A. Grigera,1* P. Gegenwart,1,2 R. A. Borzi,1 F. Weickert,2 A. J. Schofield,3 R. S. Perry,1,4,5 T. Tayama,6 T. Sakakibara,6 Y. Maeno,4,5 A. G. Green,1 A. P. Mackenzie1*

Condensed systems of strongly interacting electrons are ideal for the study of quantum complexity. It has become possible to promote the formation of new quantum phases by explicitly tuning systems toward special low-temperature quantum critical points. So far, the clearest examples have been appearances of superconductivity near pressure-tuned antiferromagnetic quantum critical points. We present experimental evidence for the formation of a nonsuperconducting phase in the vicinity of a magnetic field–tuned quantum critical point in ultrapure crystals of the ruthenate metal Sr3Ru2O7, and we discuss the possibility that the observed phase is due to a spin-dependent symmetry-breaking Fermi surface distortion.

1 School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, Scotland.
2 Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
3 School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.
4 International Innovation Center, Kyoto University, Kyoto 606-8501, Japan.
5 Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
6 Institute of Solid-State Physics, University of Tokyo, Kashiwa, Chiba 2778581, Japan.

* To whom correspondence should be addressed. E-mail: sag2{at}st-and.ac.uk; apm9{at}st-and.ac.uk

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