Evolution of the Fermi surface of BaFe2(As1-xPx){2} on entering the superconducting dome.
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 (T{c} 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 T{c}. 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.
Shishido
H
H
Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
Bangura
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AF
Coldea
A I
AI
Tonegawa
S
S
Hashimoto
K
K
Kasahara
S
S
Rourke
P M C
PM
Ikeda
H
H
Terashima
T
T
Settai
R
R
Onuki
Y
Y
Vignolles
D
D
Proust
C
C
Vignolle
B
B
McCollam
A
A
Matsuda
Y
Y
Shibauchi
T
T
Carrington
A
A