https://doi.org/10.1140/epjb/e2005-00251-y
Percolation limited magnetic order in Eu1-xCaxB6
1
Laboratorium für Festkörperphysik,
ETH-Hönggerberg, 8093 Zürich, Switzerland
2
National
High Magnetic Field Laboratory, Florida State University,
Tallahassee, Florida 32306, USA
3
Department of Physics, University
of California - Davis, CA 95616, USA
Corresponding author: a gwigger@standford.edu
Received:
27
January
2005
Revised:
29
April
2005
Published online:
11
August
2005
We report the results of measurements of the
low-temperature specific heat 
and the ac susceptibility
in low applied magnetic fields for a series of
samples of Eu
CaxB6. The anomalies in ,
together with the results for and M(H), confirm
the onset of phase transitions to long range magnetic order for
x < 0.7 and provide evidence that for x ≥ 0.7, the Eu
moments, which are captured in large magnetic clusters with
magnetic moments of the order of 260 
, adopt a spin-glass
type ground state. The data set allows to establish the
low-temperature [ T,x] phase diagram of this alloy series.
PACS: 71.30.+h – Metal-insulator transitions and other electronic transitions / 75.20.-g – Diamagnetism, paramagnetism, and superparamagnetism
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005
