Abstract
Using the de Haas–van Alphen effect we have measured the evolution of the Fermi surface of as a function of isoelectric substitution () for ( up to 25 K). We find that the volumes of electron and hole Fermi surfaces shrink linearly with decreasing . This shrinking is accompanied by a strong increase in the quasiparticle effective mass as is tuned toward the maximum . These results are not explained by simple band structure calculations, and it is likely that these trends originate from the same many-body interactions which give rise to superconductivity.
- Received 20 October 2009
DOI:https://doi.org/10.1103/PhysRevLett.104.057008
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