Temperature dependence of the propagation vector in Ni3−xCoxV2O8 with x=0.1 and 0.5

• Published in: Journal of magnetism and magnetic materials 2016-01, Vol.397, p.225-229
• Main Authors: Lee, Seongsu, Lee, Heeju, Choi, Yong Nam, Semkin, M.A., Teplykh, A.E., Skryabin, Yu.N., Li, Wen-Hsien, Pirogov, A.N.
• Format: Article
• Language: English
• Subjects: Incommensurate magnetic structure; Magnetic moment; Multiferroic; Propagation vector
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2015.08.106

We present the susceptibility and neutron diffraction data on multiferroic Ni3−xCoxV2O8 with x=0.1 and 0.5. The temperature dependence of the susceptibility indicates that the magnetic order–disorder transition occurs at THTI=8.5K in both samples. Below THTI, the high-temperature incommensurate magnetic structure is realized, which undergoes a transition to the low-temperature incommensurate phase when the sample is cooled. The temperature evolution of the propagation vector k for x=0.1 is very weak, which confirms previous studies showing that substitution of 3.5% Ni ions by Co ions suppresses the explicit temperature dependence of k that is observed in the parent compound. On the other hand, we found that the vector k for x=0.5 exhibits a definite temperature dependence, which differs from the case of the undoped sample (x=0). •There is a feature in concentration dependence of the propagation vector at x≈0.75.•Doping with 3.3% of Co crushes a temperature dependence of the propagation vector.•Doping with 16.5% of Co induces the new temperature dependence of the wave vector.