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Rigid-Band Shift of the Fermi Level in a Strongly Correlated Metal: Sr(2-y)La(y)RuO(4)

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arxiv cond-mat/0403337 v1 pith:K2VQPXW2 submitted 2004-03-13 cond-mat.str-el cond-mat.supr-con

Rigid-Band Shift of the Fermi Level in a Strongly Correlated Metal: Sr(2-y)La(y)RuO(4)

N. Kikugawa , A.P. Mackenzie , C. Bergemann , R.A. Borzi , S.A. Grigera , Y. Maeno This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords dopingelectronfermilevelmassrigid-bandshiftalphen
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report a systematic study of electron doping of Sr2RuO4 by non-isovalent substitution of La^(3+) for Sr^(2+). 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.

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