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Originally published in Science Express on 23 November 2006
Science 12 January 2007:
Vol. 315. no. 5809, pp. 214 - 217
DOI: 10.1126/science.1134796
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Reports

Formation of a Nematic Fluid at High Fields in Sr3Ru2O7

R. A. Borzi,1,2,3* S. A. Grigera,1,4 J. Farrell,1 R. S. Perry,1 S. J. S. Lister,1 S. L. Lee,1 D. A. Tennant,5 Y. Maeno,6 A. P. Mackenzie1*

In principle, a complex assembly of strongly interacting electrons can self-organize into a wide variety of collective states, but relatively few such states have been identified in practice. We report that, in the close vicinity of a metamagnetic quantum critical point, high-purity strontium ruthenate Sr3Ru2O7 possesses a large magnetoresistive anisotropy, consistent with the existence of an electronic nematic fluid. We discuss a striking phenomenological similarity between our observations and those made in high-purity two-dimensional electron fluids in gallium arsenide devices.

1 Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, UK.
2 Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata (UNLP)–Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Sucursal 4, 1900 La Plata, Argentina.
3 Departamento de Física, Instituto de Física de La Plata, UNLP, 1900 La Plata, Argentina.
4 Instituto de Física de Líquidos y Sistemas Biológicos (UNLP-CONICET–Comisión de Investigaciones Científicas), 1900 La Plata, Argentina.
5 Hahn-Meitner-Institut, Glienicker Strasse 100, D-14109 Berlin, Germany.
6 Department of Physics and International Innovation Center, Kyoto University, Kyoto 606-8501, Japan.

* To whom correspondence should be addressed. E-mail: r.chufo{at}gmail.com (R.A.B.); apm9{at}st-and.ac.uk (A.P.M.)

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