Anomalous critical behavior and localized ferromagnetism of the half-metallic double perovskite Sr2CrReO6
Anomalous critical behavior and localized ferromagnetism of the half-metallic double perovskite Sr2CrReO6
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DOI：
10.1111/jace.19502
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发表时间：
2024-02-01
影响因子：
3.9
通讯作者：
Fan，Jiyu
中科院分区：
文献类型：
--
作者：
Liu，Hao;Wang，Shuhao;Fan，Jiyu
双钙钛矿材料Sr2CrReO6由于具有较高的居里温度（TC ≥ 550 K）和较大的磁电阻效应而受到科学界的广泛关注。然而，Sr2CrReO6中高Tc和磁基态的具体物理机制仍然不清楚。为了澄清和理解这些问题，我们使用临界行为分析研究了其临界相变特性。我们发现所得到的临界指数（β = 1.115和γ = 2.224）与任何传统的普适类都有很大的不同。这种反常的临界行为表明，在量子临界点，Sr2CrReO6存在着强烈的磁相互作用竞争.通过对它们的有效临界指数的分析，我们证明了双钙钛矿结构的Sr_2CrReO_6确实是一种有序的、均匀的铁磁体。利用Takahashi的理论，证实了Sr_2CrReO_6的铁磁性是局域的，而不是巡游的。这项研究的结果将提供新的见解highTcas的起源和磁基态在这种双钙钛矿。
Double perovskites such as Sr2CrReO6attract great scientific attention owing to their high Curie temperatures (TC≥ 550 K) as well as large magnetoresistances. However, both the specific physical mechanism of highTCand magnetic ground state in Sr2CrReO6remain ill‐defined. In order to clarify and understand these issues, we studied its critical phase transition characteristics using critical behavior analysis. We found that the obtained critical exponents (β= 1.115 andγ= 2.224) are quite different from any traditional universality class. The abnormal critical behavior implies that at the quantum critical point, Sr2CrReO6exists a strong competition among several magnetic interactions. By analyzing their effective critical exponents, we show that the double perovskite Sr2CrReO6is really an ordered and homogeneous ferromagnet. With the help of Takahashi's theory, the nature of ferromagnetism in Sr2CrReO6is confirmed to be localized instead of itinerant. The results of this research will provide new insights into the origins of highTCas well as the magnetic ground state in this double perovskite.