Cd2FeReO6: A High- TC Double Perovskite Oxide with Remarkable Tunneling Magnetoresistance

Xun Kang; Ryuta Ishikawa; Alexei A Belik; Yoshihiro Tsujimoto; Masao Arai; Satoshi Kawata; Kazunari Yamaura

doi:10.1021/acs.inorgchem.3c02671

Cd₂FeReO₆: A High- T_C Double Perovskite Oxide with Remarkable Tunneling Magnetoresistance

Inorg Chem. 2023 Nov 13;62(45):18474-18484. doi: 10.1021/acs.inorgchem.3c02671. Epub 2023 Oct 31.

Authors

Xun Kang^{1

2}, Ryuta Ishikawa³, Alexei A Belik¹, Yoshihiro Tsujimoto^{1

2}, Masao Arai⁴, Satoshi Kawata³, Kazunari Yamaura^{1

2}

Affiliations

¹ Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
² Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan.
³ Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan.
⁴ Center for Basic Research on Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.

PMID: 37905815
DOI: 10.1021/acs.inorgchem.3c02671

Abstract

In this study, we successfully synthesized the double perovskite oxide Cd₂FeReO₆ by using a high-temperature and high-pressure method. The crystal structure was confirmed to belong to the P2₁/n space group, exhibiting approximately 68% ordering of Fe³⁺ and Re⁵⁺ ions at the perovskite B-site with the remaining regions showing antisite disorder. The measured Curie temperature of Cd₂FeReO₆ was 460 K, slightly lower than expected but still significantly above room temperature. Remarkably, Cd₂FeReO₆ displayed a remarkable low-field butterfly type tunneling magnetoresistance of -23% (-37% between the lowest and the largest values) at 5 K and 90 kOe, the highest among the A₂FeReO₆ (A = Ca, Sr, Pb, Ba) family. First-principles calculations provided insight into the origin of this observed magnetoresistance behavior, revealing Cd₂FeReO₆'s half-metallic ferrimagnetic nature. This research extends our understanding of the double perovskite family and emphasizes its potential significance in the domains of spintronics and materials science. The exploration of differing magnetoresistance behaviors between Cd₂FeReO₆ and Ca₂FeReO₆, along with the influence of antisite disorder in Cd₂FeReO₆, opens intriguing avenues for further research.