Unraveling the nature of Fe-doping mediated inter- and intra-chain interactions in Ca3Co2O6

JOURNAL OF ALLOYS AND COMPOUNDS

卷:851

Article

Das, R.^1,2,3  Dang, N. T.^4,5  Kalappattil, V¹  Madhogaria, R. P.¹  Kozlenko, D. P.⁶  Kichanov, S. E.⁶  Lukin, E., V⁶  Rutkaukas, A., V⁶  Nguyen, T. P. T.^4,5  Thao, L. T. P.^7,8  Bingham, N. S.⁹  Srikanth, H.¹  Phan, M. H.¹ 

[1] Univ S Florida, Dept Phys, Tampa, FL 33620 USA

[2] Phenikaa Univ, Fac Mat Sci & Engn, Hanoi 10000, Vietnam

[3] Phenikaa Univ, Phenikaa Inst Adv Study PIAS, Hanoi 10000, Vietnam

[4] Duy Tan Univ, Inst Res & Dev, Danang 550000, Vietnam

[5] Duy Tan Univ, Fac Nat Sci, Danang 550000, Vietnam

[6] Joint Inst Nucl Res, Frank Lab Neutron Phys, Dubna 141980, Russia

[7] Univ Danang, Univ Educ, Danang 550000, Vietnam

[8] Hue Univ, Univ Sci, Dept Phys, Hue 530000, Vietnam

[9] Yale Univ, Dept Appl Phys, New Haven, CT 06511 USA

关键词: Multiferroics;    Neutron diffraction;    Magnetoelectrics;    Lowdimensional magnetism;   

DOI  :  10.1016/j.jallcom.2020.156897

来源: Elsevier

【 摘 要 】

The structural and magnetic properties of quasi-one-dimensional (1D) spin-chain compounds Ca3Co2-xFexO6 (x = 0, 0.1, 0.2 and 0.3) synthesized by a sol-gel method have been systematically studied by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), neutron powder diffraction (NPD), dc and ac magnetization measurements. The samples adopt a rhombohedral crystal structure with the space group R-3c in a temperature range of 5-100 K. Fe ions are found to locate at the trigonal prism Co2 crystallographic sites. Fe doping converts some of low-spin Co3+ ions at Co1 octahedral sites into Co2+ ions. For the high-temperature paramagnetic phase, the Curie paramagnetic temperature theta(p) changes its sign from positive to negative at x = 0.2, implying that the dominant magnetic interaction is driven from ferromagnetic (FM) to antiferromagnetic (AFM) upon Fe substitution. A partial low-spin to high-spin state crossover of the Co1 ions is observed at high Fe-doping level x = 0.3. All the samples exhibit a long-range spin-density wave (SDW) AFM ordering below T-N, followed by a spin-glass-like transition at T-f. These low-temperature magnetic phases were significantly suppressed upon Fe doping. The Fe substitution in Ca3Co2-xFexO6 weakened both intrachain and interchain magnetic interactions, caused by enhanced magnetic disorder due to the different magnetic characters of Ising Co and Heisenberg Fe spins. (C) 2020 Elsevier B.V. All rights reserved.

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