de Haas-van Alphen effect in ZrZn2 under pressure: crossover between two magnetic states.
We report measurements of the de Haas-van Alphen effect in ZrZn2 under hydrostatic pressures up to 21 kbar where the Curie temperature vanishes. The exchange splitting of a Fermi surface changes in behavior with increasing magnetic field, which is qualitatively consistent with the behavior of the high-field magnetization, suggesting the existence of a crossover between two distinct magnetic states. These and previously unexplained findings may be understood in terms of a p-T-B phase diagram qualitatively similar to that of the ferromagnetic superconductor UGe2.
Kimura
N
N
Center for Low Temperature Science, Tohoku University, Sendai, Miyagi 980-8578, Japan.
Endo
M
M
Isshiki
T
T
Minagawa
S
S
Ochiai
A
A
Aoki
H
H
Terashima
T
T
Uji
S
S
Matsumoto
T
T
Lonzarich
G G
GG