Structural-transition-driven antiferromagnetic to spin-glass transition in Cd-Mg-Tb 1/1 approximants

Farid Labib; Daisuke Okuyama; Nobuhisa Fujita; Tsunetomo Yamada; Satoshi Ohhashi; Daisuke Morikawa; Kenji Tsuda; Taku J Sato; An-Pang Tsai

doi:10.1088/1361-648X/aba921

Structural-transition-driven antiferromagnetic to spin-glass transition in Cd-Mg-Tb 1/1 approximants

J Phys Condens Matter. 2020 Sep 3;32(48). doi: 10.1088/1361-648X/aba921.

Authors

Farid Labib¹, Daisuke Okuyama¹, Nobuhisa Fujita¹, Tsunetomo Yamada², Satoshi Ohhashi¹, Daisuke Morikawa¹, Kenji Tsuda³, Taku J Sato¹, An-Pang Tsai¹

Affiliations

¹ Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan.
² Faculty of Science, Department of Applied Physics, Tokyo University of Science, Katsushika-ku, Tokyo, Japan.
³ Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan.

PMID: 32707571
DOI: 10.1088/1361-648X/aba921

Abstract

The magnetic susceptibility of the 1/1 approximants to icosahedral quasicrystals in a series of Cd_85-xMg_xTb₁₅(x= 5, 10, 15, 20) alloys was investigated in detail. The occurrence of antiferromagnetic (AFM) to spin-glass (SG)-like transition was noticed by increasing Mg. Transmission electron microscopy analysis evidenced a correlation between the magnetic transition and suppression of the monoclinic superlattice ordering with respect to the orientation of the Cd₄tetrahedron atT> 100 K. The possible origins of this phenomenon were discussed in detail. The occurrence of the AFM to SG-like magnetic transition is associated with the combination of chemical disorder due to a randomized substitution of Cd with Mg and the orientational disorder of the Cd₄tetrahedra.

Keywords: antiferromagnetism; approximants; magnesium alloys; magnetism; spin glass.