Heavy-mass fermi liquid near a ferromagnetic instability in layered ruthenates.
Low temperature magnetic, thermal, and transport measurements in Ca2-xSrxRuO4 clarify the appearance of a cluster glass phase, after the evolution of a nearly ferromagnetic heavy-mass Fermi liquid from the spin-triplet superconductor Sr2RuO4. As the Mott transition is approached across a 2nd-order structural transition, both the magnetization and specific heat decrease considerably while the transport scattering rate diverges. A metamagnetic transition to a highly spin polarized state, with a local moment S=1/2, is observed. We argue that an orbital rearrangement with Ca substitution changes itinerant ferromagnetism to antiferromagnetism of localized moments.
Nakatsuji
S
S
National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, USA.
Hall
D
D
Balicas
L
L
Fisk
Z
Z
Sugahara
K
K
Yoshioka
M
M
Maeno
Y
Y