Quasi-one-dimensional magnetic interactions and conduction electrons in EuCu5 and EuAu5 with the characteristic hexagonal structure. Issue 10 (18th May 2020)

• Record Type: Journal Article
• Authors: Matsuda, S.; Ota, J.; Nakaima, K.; Iha, W.; Gouchi, J.; Uwatoko, Y.; Nakashima, M.; Amako, Y.; Honda, F.; Aoki, D.; Nakamura, A.; Takeuchi, T.; Haga, Y.; Harima, H.; Hedo, M.; Nakama, T.; Ōnuki, Y.
• Is Part Of: Philosophical magazine. Volume 100:Issue 10(2020)
• Page Start: 1244
• Page End: 1257
• Publication Date: 2020-05-18
• Subjects: Single crystal growth -- EuCu5 -- EuAu5 -- ferromagnets -- dHvA -- Fermi surfaces; Condensed matter -- Periodicals; Physics -- Periodicals; Matière condensée -- Périodiques; Physique -- Périodiques; 530.41
• DOI: 10.1080/14786435.2019.1708498
• Languages: English
• ISSNs: 1478-6435

Abstract

ABSTRACT: We have succeed in growing single crystals of EuCu 5 and EuAu 5 with the hexagonal structure by the Bridgman method. Both compounds are known to be ferromagnets with Curie temperatures T C = 57 and 13 K, respectively, and the Eu-4 f magnetic moments of EuCu 5 are known to orient along the hexagonal c -axis or the [0001] direction by the Mössbauer experiment. The magnetisations at 2 K in EuCu 5 and EuAu 5 in the present experiment saturate at an extremely low field of 2 kOe for H ∥ [ 0001 ], with a Eu 2 + -moment of 7 μ B / E u . On the other hand, the hard-axis magnetisations for H ⊥ [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 J ∥ [0001] in EuCu 5 and EuAu 5 are about 10 μ Ω ⋅ c m at room temperature, which are compared with the resistivities of ρ = 30–40 μ Ω ⋅ c m for J ⊥ [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 5, revealing the existence of a large plate-like Fermi surface.