Effect of Ti 4+ Substitution on Microstructure and Magnetic Order of Ca 3 CoMn 1-x Ti x O 6
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ORIGINAL PAPER
Effect of Ti4+ Substitution on Microstructure and Magnetic Order of Ca3CoMn1-xTixO6 Gaoshang Gong 1 & Huiyun Hu 1 & Chenfei Shi 1 & Yongqiang Wang 1 & Yawei Gao 1 & Yaqiong Su 2 & Jinjin Guo 1 & Yanmin Ma 1 & Yuling Su 1 Received: 7 May 2020 / Accepted: 16 June 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The Ca3CoMn1-xTixO6(x = 0, 0.05) samples were synthesized by a modified sol-gel method, and the microstructure, microtopography, and magnetic properties were investigated in detail. With substituting of Mn4+ ions by Ti4+ ions, the crystallinity and particle size of Ca3CoMn1-xTixO6 (x = 0, 0.05) samples decrease. The Ti4+ doping also causes the high-temperature spin freezing phenomenon disappears, and the transition field of ↑↑↓↓ magnetic structure to ↑↑↑↓ magnetic structure increases obviously together with the faster dynamic behavior. These results suggest that the dilution effect of Ti4+ doping to Co-Mn-CoMn spin chains could reduce the degree of magnetic frustration and suppress the formation of short range magnetic order, for which will be beneficial for the establishment of more robust long range antiferromagnetic structure. The present research could serve as a reference on tuning the magnetic order and improving the multiferroic property of Ca3CoMnO6. Keywords Frustration . One-dimension . Magnetization
1 Introduction The rich physical properties and complicated magnetic interaction of magnetic frustrated system have attracted great attention [1–3]. One typical example is the K4CdCl6-derived structural one-dimensional Ca3Co2O6, for which is composed by alternative CoO6 trigonal prisms and CoO6 octahedra along c axis [4–7]. In ab plane, every chain is surrounded by six spaced chains, forming of triangular lattice with Ca2+ ions located between them [8]. Although the Co ions situated at both the trigonal sites and octahedral sites are in +3 valence state, different spin states are manifested related to the different crystal field. For the trigonal site Co3+ ions, the spin state is S = 2, and for the octahedral site Co3+ ions, the spin state
* Yuling Su [email protected] 1
School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, People’s Republic of China
2
Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
becomes S = 0 [9]. Along c axis, the exchange constant between the next-nearest Co3+ ions is a positive value, the intrachain spin moment tend to rank in same direction and onedimensional ferromagnetic chain is formed [10]. In ab plane, the negative exchange constant between different spin chains results in the antiferromagnetic inter-chain interaction [11]. The incompatibility of geometric structure and local magnetic interaction causes the existence of spin frustration. As a consequence, partially dis
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