Evolution of the Fermi Surface of BaFe2(As1-xPx)2 on Entering the Superconducting Dome
Abstract
Using the de Haas-van Alphen effect we have measured the evolution of the Fermi surface of BaFe2(As1-xPx)2 as a function of isoelectric substitution (As/P) for 0.41<x<1 (Tc up to 25 K). We find that the volumes of electron and hole Fermi surfaces shrink linearly with decreasing x. This shrinking is accompanied by a strong increase in the quasiparticle effective mass as x is tuned toward the maximum Tc. 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.
- Publication:
-
Physical Review Letters
- Pub Date:
- February 2010
- DOI:
- 10.1103/PhysRevLett.104.057008
- arXiv:
- arXiv:0910.3634
- Bibcode:
- 2010PhRvL.104e7008S
- Keywords:
-
- 74.70.-b;
- 71.18.+y;
- 74.25.Jb;
- Superconducting materials;
- Fermi surface: calculations and measurements;
- effective mass g factor;
- Electronic structure;
- Condensed Matter - Superconductivity
- E-Print:
- 4 pages