Giant caloric effects in charge?spin?lattice coupled transition-metal oxides
Giant caloric effects in charge?spin?lattice coupled transition-metal oxides
复制标题
电荷自旋晶格耦合过渡金属氧化物中的巨热效应
DOI：
10.1039/d2ta09186k
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发表时间：
2023
影响因子：
11.9
通讯作者：
Kosugi Yoshihisa
中科院分区：
文献类型：
--
作者：
Shimakawa Yuichi;Kosugi Yoshihisa
固体的热量效应可以为我们提供高效且环保的能源系统。探索新型热量材料具有挑战性，但对于开发未来技术至关重要。典型的固体热效应是分别由磁场、电场和压力引起的磁热效应、电热效应和压热效应，通过这些效应表现出大热响应的材料近年来引起了广泛的关注。在这篇透视文章中，重点介绍了具有巨大热量效应的新型过渡金属氧化物。这些化合物是 NdCu3Fe4O12 和 BiCu3Cr4O12，含有异常高价态的过渡金属离子，并表现出电荷跃迁以缓解电子不稳定性。化合物中的电荷、自旋和晶格自由度密切相关，主要感应的电荷跃迁引起不寻常的一阶磁相变，从而提供显着的潜热。重要的是，大量的潜热可以通过多种方式通过热量效应得到利用。总结了电荷-自旋-晶格耦合过渡金属氧化物中巨热效应的细节，并讨论了该效应的机制。
The caloric effects of solids can provide us with highly efficient and environmentally friendly energy systems. Exploring novel caloric materials is challenging but critically important in developing future technologies. Typical solid caloric effects are magnetocaloric, electrocaloric, and barocaloric effects induced respectively by magnetic fields, electric fields, and pressure, and materials showing large caloric responses through the effects attract lots of recent attention. In this perspective article, novel transition-metal oxides that show giant caloric effects are highlighted. The compounds are NdCu3Fe4O12 and BiCu3Cr4O12 containing unusually high valence states of transition-metal ions and show charge transitions to relieve the electronic instabilities. The charge, spin, and lattice degrees of freedom in the compounds are strongly correlated and the primarily induced charge transitions cause unusual first-order magnetic phase transitions that provide significant latent heat. Importantly, the large latent heat can be utilized through the caloric effects in multiple ways. The details of the giant caloric effects in the charge–spin–lattice coupled transition-metal oxides are summarized and the mechanism of the effects is discussed.