TY - JOUR
T1 - Quasi-one-dimensional magnetic interactions and conduction electrons in EuCu5 and EuAu5 with the characteristic hexagonal structure
AU - Matsuda, S.
AU - Ota, J.
AU - Nakaima, K.
AU - Iha, W.
AU - Gouchi, J.
AU - Uwatoko, Y.
AU - Nakashima, M.
AU - Amako, Y.
AU - Honda, F.
AU - Aoki, D.
AU - Nakamura, A.
AU - Takeuchi, T.
AU - Haga, Y.
AU - Harima, H.
AU - Hedo, M.
AU - Nakama, T.
AU - Ōnuki, Y.
N1 - Funding Information:
This work was supported by JSPS KAKENHI [grant numbers JP18H04329, JP17K05547, JP15H05882, JP15H05886, JP15H05884, and JP16K05453]. 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.
Publisher Copyright:
© 2020, © 2020 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2020/5/18
Y1 - 2020/5/18
N2 - We have succeed in growing single crystals of EuCu (Formula presented.) and EuAu (Formula presented.) with the hexagonal structure by the Bridgman method. Both compounds are known to be ferromagnets with Curie temperatures (Formula presented.) and 13 K, respectively, and the Eu-4f magnetic moments of EuCu (Formula presented.) are known to orient along the hexagonal c-axis or the [0001] direction by the Mössbauer experiment. The magnetisations at 2 K in EuCu (Formula presented.) and EuAu (Formula presented.) in the present experiment saturate at an extremely low field of 2 kOe for (Formula presented.), with a Eu (Formula presented.) -moment of (Formula presented.). On the other hand, the hard-axis magnetisations for (Formula presented.) [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 (Formula presented.) [0001] in EuCu (Formula presented.) and EuAu (Formula presented.) are about (Formula presented.) at room temperature, which are compared with the resistivities of (Formula presented.) 30–40 (Formula presented.) for (Formula presented.) [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 (Formula presented.), revealing the existence of a large plate-like Fermi surface.
AB - We have succeed in growing single crystals of EuCu (Formula presented.) and EuAu (Formula presented.) with the hexagonal structure by the Bridgman method. Both compounds are known to be ferromagnets with Curie temperatures (Formula presented.) and 13 K, respectively, and the Eu-4f magnetic moments of EuCu (Formula presented.) are known to orient along the hexagonal c-axis or the [0001] direction by the Mössbauer experiment. The magnetisations at 2 K in EuCu (Formula presented.) and EuAu (Formula presented.) in the present experiment saturate at an extremely low field of 2 kOe for (Formula presented.), with a Eu (Formula presented.) -moment of (Formula presented.). On the other hand, the hard-axis magnetisations for (Formula presented.) [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 (Formula presented.) [0001] in EuCu (Formula presented.) and EuAu (Formula presented.) are about (Formula presented.) at room temperature, which are compared with the resistivities of (Formula presented.) 30–40 (Formula presented.) for (Formula presented.) [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 (Formula presented.), revealing the existence of a large plate-like Fermi surface.
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U2 - 10.1080/14786435.2019.1708498
DO - 10.1080/14786435.2019.1708498
M3 - Article
AN - SCOPUS:85077898994
SN - 1478-6435
VL - 100
SP - 1244
EP - 1257
JO - Philosophical Magazine
JF - Philosophical Magazine
IS - 10
ER -