Dependence of the effective masses in YbAl3 on magnetic field and disorder.
The susceptibility and specific heat--and hence the effective mass--of the intermediate valence compound YbAl3 show anomalous enhancement below the Fermi liquid temperature T(coh) approximately 40 K. We show that these anomalies are suppressed by alloying in Yb1-xLuxAl3 indicating high sensitivity to lattice coherence. The de Haas-van Alphen effective masses for key branches of the Fermi surface are reduced by magnetic fields B>40 T. We argue that this reduction does not arise from 4f polarization but reflects renormalization of the quasiparticle states by the field.
Ebihara
T
T
Shizuoka University, Shizuoka 422-8529, Japan.
Bauer
E D
ED
Cornelius
A L
AL
Lawrence
J M
JM
Harrison
N
N
Thompson
J D
JD
Sarrao
J L
JL
Hundley
M F
MF
Uji
S
S