Observation of A -site antiferromagnetic and B -site ferrimagnetic orderings in the quadruple perovskite oxide Ca Cu 3 Co <…
2021; American Physical Society; Volume: 103; Issue: 1 Linguagem: Inglês
10.1103/physrevb.103.014414
ISSN2469-9977
AutoresZhehong Liu, Xiao Wang, Xubin Ye, Xudong Shen, Yuecheng Bian, Wei Ding, Stefano Agrestini, Sheng-Chieh Liao, Hong‐Ji Lin, Chien‐Te Chen, Shih‐Chang Weng, Kai Chen, Philippe Ohresser, Lucie Nataf, F. Baudelet, Zhigao Sheng, S. Francoual, J. R. L. Mardegan, O. Leupold, Zefang Li, Xuekui Xi, Wenhong Wang, L. H. Tjeng, Zhiwei Hu, Youwen Long,
Tópico(s)Advanced Condensed Matter Physics
ResumoA quadruple perovskite oxide $\mathrm{Ca}{\mathrm{Cu}}_{3}{\mathrm{Co}}_{2}{\mathrm{Re}}_{2}{\mathrm{O}}_{12}$ was synthesized by high-pressure annealing. This compound crystallizes in an $A$- and $B$-site ordered quadruple perovskite structure with space group $Pn\text{\ensuremath{-}}3$. The charge combination is determined to be $\mathrm{Ca}{{\mathrm{Cu}}^{2+}}_{3}{{\mathrm{Co}}^{2+}}_{2}{{\mathrm{Re}}^{6+}}_{2}{\mathrm{O}}_{12}$ by bond valence sum analysis and x-ray absorption spectroscopy. In contrast to other isostructural $A{\mathrm{Cu}}_{3}{B}_{2}{B}_{2}^{\ensuremath{'}}{O}_{12}$ compounds with a single magnetic transition, a long-range antiferromagnetic phase transition originating from the ${A}^{\ensuremath{'}}$-site ${\mathrm{Cu}}^{2+}$ sublattice is found to occur at ${T}_{N}\ensuremath{\approx}28\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Subsequently, the spin coupling between the $B$-site ${\mathrm{Co}}^{2+}$ and ${B}^{\ensuremath{'}}$-site ${\mathrm{Re}}^{6+}$ ions contributes to a ferrimagnetic transition around ${T}_{\mathrm{C}}\ensuremath{\approx}20\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Strong electrical insulating behavior is identified by optical measurement with an energy gap of approximately 3.75 eV. The mechanisms of the spin interactions are discussed in detail.
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