Evolution of Fermi-liquid interactions in Sr2RuO4 under pressure.
We have measured the temperature and field dependence of the resistivity of the unconventional superconductor Sr2RuO4 at pressures up to 3.3 GPa. Using the Shubnikov-de Haas effect, we find that the Fermi surface sheet believed to be primarily responsible for superconductivity becomes more two-dimensional with increasing pressure, a surprising result that is, however, consistent with a recent model of orbital-dependent superconductivity in this system. Many-body enhancements and the superconducting transition temperature all fall gradually with increasing pressure, contrary to previous suggestions of a ferromagnetic quantum critical point at approximately 3 GPa.
Forsythe
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D
Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 OHE, United Kingdom.
Julian
S R
SR
Bergemann
C
C
Pugh
E
E
Steiner
M J
MJ
Alireza
P L
PL
McMullan
G J
GJ
Nakamura
F
F
Haselwimmer
R K W
RK
Walker
I R
IR
Saxena
S S
SS
Lonzarich
G G
GG
Mackenzie
A P
AP
Mao
Z Q
ZQ
Maeno
Y
Y