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High-temperature ferrimagnetic order triggered metal-to-insulator transition in CaCu3Ni2Os2O12
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High-temperature ferrimagnetic order triggered metal-to-insulator transition in CaCu3Ni2Os2O12
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Journal Article
High-temperature ferrimagnetic order triggered metal-to-insulator transition in CaCu3Ni2Os2O12
2025
Overview
Ferromagnetic order-induced insulator-to-metal transitions via the double exchange mechanism have been studied widely. In contrast, ferromagnetic or ferrimagnetic spontaneous magnetization induced metal-to-insulator transitions (MITs), especially occurring above room temperature, remain extremely limited, although such magnetoelectric materials hold great potential for low-loss multifunctional electronic and spintronic devices. Here, a novel 3
d/
5
d
hybridized quadruple perovskite oxide, CaCu
3
Ni
2
Os
2
O
12
, was synthesized. It undergoes long-range Cu
2+
(↑)–Ni
2+
(↑)–Os
6+
(↓) ferrimagnetic order with a high Curie temperature of 393 K, maintaining a saturated magnetization of 2.15 μ
B
/f.u. at 300 K. Intriguingly, an MIT is found to occur concurrently at the Curie temperature. Theoretical analyses reveal that the ferrimagnetic spontaneous order significantly renormalizes the electronic band structure, which can be further modified by electronic correlation and spin–orbit coupling effects, leading to the MIT via the Lifshitz-type mechanism. This work thus provides a paradigm material to realize ferrimagnetic spontaneous magnetization induced MIT at a high critical temperature toward advanced applications.
Insulator-to-metal transitions induced by spontaneous magnetization above room temperature have rarely been observed. Here, the authors show that this transition, along with concurrent high-temperature ferrimagnetic order, is realized in the novel 3d/5d hybridized quadruple perovskite oxide CaCu
3
Ni
2
Os
2
O
12
.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
