Cd-content and temperature dependences of hyperfine fields in CdxFe3-xO4

W Sato; M Fujii; M Konaka; T Ito; H Hirahara; S Komatsuda; A Taniguchi; Y Ohkubo

doi:10.1016/j.apradiso.2024.111320

Cd-content and temperature dependences of hyperfine fields in Cd_xFe_3-xO₄

Appl Radiat Isot. 2024 Apr 16:209:111320. doi: 10.1016/j.apradiso.2024.111320. Online ahead of print.

Authors

W Sato¹, M Fujii², M Konaka³, T Ito², H Hirahara³, S Komatsuda⁴, A Taniguchi⁵, Y Ohkubo⁵

Affiliations

¹ Institute of Science and Engineering, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan. Electronic address: wsato@se.kanazawa-u.ac.jp.
² Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan.
³ School of Chemistry, Kanazawa University, Kanazawa, Ishikawa, 920-1192, Japan.
⁴ Institute of Human and Social Sciences, Kanazawa University, Kanazawa, Ishikawa, 920-1192, Japan.
⁵ Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka, 590-0494, Japan.

PMID: 38677203
DOI: 10.1016/j.apradiso.2024.111320

Abstract

Cd-content and temperature dependences of hyperfine fields in Cd_xFe_3-xO₄ (0 ≤ x ≤ 0.5) were investigated by means of time-differential perturbed angular correlation spectroscopy with the ¹¹¹Cd(←¹¹¹In) probe. It was found that Cd²⁺ ions selectively occupy the tetrahedral A site in the spinel structure in all the range of the present Cd content x. The magnetic transition temperature T_C becomes lower with increasing x due to the interference of the long-range ordering of Fe spins as a result of expansion of the lattice constants by Cd doping. The measurement of room-temperature hyperfine fields at different x shows that the supertransferred magnetic hyperfine field (SMHF) at the probe decreases as x increases in the range of 0 ≤ x ≤ 0.5. Isothermal measurements at 15 K revealed a contrastive phenomenon for the Cd contents up to x = 0.4: the SMHF becomes great with increasing x; however, this increasing trend of the SMHF turns to reduction at x = 0.46. These observations can be explained based on the effect of Cd doping on the antiferromagnetic coupling between Fe ions in the A and B sites.