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Phys. Rev. B 70, 060508(R) (2004) [4 pages]

Rigid-band shift of the Fermi level in the strongly correlated metal: Sr2−yLayRuO4

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N. Kikugawa1,2,3, A. P. Mackenzie1, C. Bergemann4, R. A. Borzi1, S. A. Grigera1, and Y. Maeno3,5
1School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, United Kingdom
2Venture Business Laboratory, Kyoto University, Kyoto 606-8501, Japan
3Department of Physics, Kyoto University, Kyoto 606-8502, Japan
4Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom
5International Innovation Center, Kyoto University, Kyoto 606-8501, Japan

Received 7 June 2004; published 31 August 2004

We report a systematic study of electron doping of Sr2RuO4 by nonisovalent substitution of La3+ for Sr2+. Using a combination of de Haas-van Alphen oscillations, specific heat, and resistivity measurements, we show that electron doping leads to a rigid-band shift of the Fermi level corresponding to one doped electron per La ion, with constant many-body quasiparticle mass enhancement over the band mass. The susceptibility spectrum is substantially altered and enhanced by the doping but this has surprisingly little effect on the strength of the unconventional superconducting pairing.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.060508
DOI:
10.1103/PhysRevB.70.060508
PACS:
74.70.Pq, 74.25.Jb, 74.62.Dh
 
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