反铁磁性
凝聚态物理
正交晶系
基态
磁化
材料科学
居里温度
铁磁性
磁矩
挫折感
电子结构
交换互动
锰铁矿
化学
晶体结构
磁场
物理
结晶学
量子力学
作者
Hiroomi Takahashi,Masaho Onose,Yasuhito Kobayashi,Takahiro Osaka,Soushi Maeda,Atsushi Miyake,Masashi Tokunaga,Hajime Sagayama,Y. Yamasaki,Shintaro Ishiwata
出处
期刊:APL Materials
[American Institute of Physics]
日期:2022-11-01
卷期号:10 (11)
摘要
We systematically synthesized perovskite-type oxides Sr1-xCaxCoO3 containing unusually high valence Co4+ ions by a high pressure technique, and investigated the effect of systematic lattice change on the magnetic and electronic properties. As the Ca content x exceeds about 0.6, the structure changes from cubic to orthorhombic, which is supported by the first-principles calculations of enthalpy. Upon the orthorhombic distortion, the ground state remains to be apparently ferromagnetic with a slight drop of the Curie temperature. Importantly, the compounds with x larger than 0.8 show antiferromagnetic behavior with positive Weiss temperatures and nonlinear magnetization curves at lowest temperature, implying that the ground state is noncollinear antiferromagnetic or helimagnetic. Considering the incoherent metallic behavior and the suppression of the electronic specific heat at high x region, the possible emergence of a helimagnetic state in Sr1-xCaxCoO3 is discussed in terms of the band-width narrowing and the double-exchange mechanism with the negative charge transfer energy as well as the spin frustration owing to the next-nearest neighbor interaction.
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