ABSTRACT
We have succeed in growing single crystals of EuCu and EuAu
with the hexagonal structure by the Bridgman method. Both compounds are known to be ferromagnets with Curie temperatures
and 13 K, respectively, and the Eu-4f magnetic moments of EuCu
are known to orient along the hexagonal c-axis or the [0001] direction by the Mössbauer experiment. The magnetisations at 2 K in EuCu
and EuAu
in the present experiment saturate at an extremely low field of 2 kOe for
, with a Eu
-moment of
. On the other hand, the hard-axis magnetisations for
[0001] saturate at a high field of 40 kOe. It is also found from the electrical resistivty measurement that the electrical resistivities along the current
[0001] in EuCu
and EuAu
are about
at room temperature, which are compared with the resistivities of
30–40
for
[0001]. The quasi-one dimensional conductivities are also characteristic, which were clarified from the de Haas-van Alphen (dHvA) experiment and FLAPW energy band calculation for EuAu
, revealing the existence of a large plate-like Fermi surface.
Acknowledgments
The authors are very grateful to Prof. H. Kawamura and Dr. K. Aoyama for helpful discussions. Thanks are also to Prof. M. Brian Maple for stimulating and fruitful discussions on exotic superconductivity and non-Fermi liquid of heavy fermions.
Disclosure statement
No potential conflict of interest was reported by the authors.