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Crystal and Magnetic Structures of La2CoPtO6 Double Perovskite
ACS Omega ( IF 3.7 ) Pub Date : 2018-09-21 00:00:00 , DOI: 10.1021/acsomega.8b01701 Sanghyun Lee , Min-Cheol Lee 1, 2 , Yoshihisa Ishikawa , Ping Miao , Shuki Torii , Choongjae Won 3 , Kyungdong Lee 3 , Namjung Hur 3 , Deok-Yong Cho 4 , Takashi Kamiyama
ACS Omega ( IF 3.7 ) Pub Date : 2018-09-21 00:00:00 , DOI: 10.1021/acsomega.8b01701 Sanghyun Lee , Min-Cheol Lee 1, 2 , Yoshihisa Ishikawa , Ping Miao , Shuki Torii , Choongjae Won 3 , Kyungdong Lee 3 , Namjung Hur 3 , Deok-Yong Cho 4 , Takashi Kamiyama
Affiliation
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We investigated the crystal structure and magnetic structure in cobaltite-platinate double perovskite of La2CoPtO6, employing various techniques of X-ray diffraction, neutron diffraction, and the extended X-ray absorption fine structure analysis. It is shown that the crystal symmetry is maintained as P21/n in the temperature range of <500 °C, whereas the lattice constants and the Co–Co distances undergo a continuous structural evolution toward the high-symmetry phases with increasing temperature. The Co–O bonds were overall longer and had a larger degree of structural and thermal disorders than the Pt–O bonds. As for the magnetism, an antiferromagnetic order is stabilized in the Co2+ sublattice at temperatures below 28 K. It is demonstrated that owing to the substantial distortions (quantified by a distortion parameter Σ > 0.03 Å) of the Co–Co networks, the system is not subject to spin frustration effect. Details in the magnetic structure are determined; at 12 K, the Co magnetic moment was (0.8, 0, 2.7) Bohr magneton, the magnetic propagation vector was (−0.5, 0, 0.5), and the magnetic symmetry was preferably Γ1(Ag).
中文翻译：
La 2 CoPtO 6双钙钛矿的晶体和磁性结构
我们使用各种X射线衍射，中子衍射和扩展X射线吸收精细结构分析技术，研究了La 2 CoPtO 6的钴-铂酸盐双钙钛矿中的晶体结构和磁性结构。结果表明，在<500°C的温度范围内，晶体的对称性保持为P 2 1 / n，而随着温度的升高，晶格常数和Co-Co距离向高对称相经历连续的结构演化。与Pt-O键相比，Co-O键总体上更长，并且具有更大程度的结构和热失调。至于磁性，Co 2+中的反铁磁顺序是稳定的低于28 K的亚晶格。证明了由于Co-Co网络的大量畸变（由畸变参数Σ> 0.03Å量化），该系统不受自旋挫折效应的影响。确定了磁性结构的细节；以12K，将Co磁矩是（0.8，0，2.7）玻尔磁子，磁传播矢量为（-0.5，0，0.5），和磁对称性是优选Γ 1（A克）。
更新日期：2018-09-21
中文翻译：
La 2 CoPtO 6双钙钛矿的晶体和磁性结构
我们使用各种X射线衍射，中子衍射和扩展X射线吸收精细结构分析技术，研究了La 2 CoPtO 6的钴-铂酸盐双钙钛矿中的晶体结构和磁性结构。结果表明，在<500°C的温度范围内，晶体的对称性保持为P 2 1 / n，而随着温度的升高，晶格常数和Co-Co距离向高对称相经历连续的结构演化。与Pt-O键相比，Co-O键总体上更长，并且具有更大程度的结构和热失调。至于磁性，Co 2+中的反铁磁顺序是稳定的低于28 K的亚晶格。证明了由于Co-Co网络的大量畸变（由畸变参数Σ> 0.03Å量化），该系统不受自旋挫折效应的影响。确定了磁性结构的细节；以12K，将Co磁矩是（0.8，0，2.7）玻尔磁子，磁传播矢量为（-0.5，0，0.5），和磁对称性是优选Γ 1（A克）。
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