Rigid-Band Shift of the Fermi Level in a Strongly Correlated Metal: Sr2RuO4

KIKUGAWA, N.; P. MACKENZIE, A.; BERGEMANN, C.; RODOLFO ALBERTO BORZI; A. GRIGERA, S.; MAENO, Y.

Physical Review B - Condensed Matter and Materials Physics

Año: 2004 vol. 70 p. 1 - 1

0163-1829

   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 showthat electron doping leads to a rigid-band shift of the Fermi level corresponding to one doped electron per Laion, with constant many-body quasiparticle mass enhancement over the band mass. The susceptibility spectrumis substantially altered and enhanced by the doping but this has surprisingly little effect on the strength of theunconventional superconducting pairing.