Effect of Ti ion doping on martensitic transition of La0.5Sr0.5Mn1−xTixO3

• Published in: Journal of alloys and compounds Vol. 588; pp. 53 - 58
• Main Authors: Shang, C., Xia, Z.C., Jin, Z., Shi, L.R., Huang, J.W., Chen, B.R., Wei, M., Xiao, L.X., Liu, L., Huang, Y.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 05-03-2014; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Doping; Exact sciences and technology; Localization; Magnetic properties and materials; Magnetotransport phenomena, materials for magnetotransport; Manganite; Manganites; Martensitic transition; Physics; Manganite; Martensitic transition; Localization; Doping; Double exchange; Local magnetic moment; Magnetization; Charge ordering; Martensitic transformations; Magnetic field effects; Magnetic domains; Chemical composition; Ferromagnetism; Exchange interactions; Manganites
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2013.11.030

•Electrical transport and magnetic properties of La0.5Sr0.5Mn1−xTixO3 (x=0, 0.1, 0.15, 0.2) have been investigated.•Electrical transport and magnetic properties are different for different doping level samples.•A martensitic transition was observed in the samples of x=0.15 and x=0.2.•Localization and pinning effect were used to interpret the effect of doping level on magnetization.
Electrical transport and magnetic properties of La0.5Sr0.5Mn1−xTixO3 (x=0, 0.1, 0.15 and 0.2) have been investigated. Experimental results show that the different Ti4+ doping level has obviously different effect on electrical transport and magnetization properties. Especially, a martensitic transition was observed in higher Ti4+ doping levels (x=0.15, 0.2). In which a doped Ti4+ ion substitutes a Mn4+ ion, with increasing in Ti4+ doping level from x=0 to 0.2, the ratio of Mn3+/Mn4+ increases from 1 to 5/3, that is the coupling via Mn3+–O2−–Mn4+ double exchange increases leading to a localized ferromagnetic domain in the charge ordering of matrix of La0.5Sr0.5MnO3. With the increasing of magnetic field to a critical field, the localized magnetic moment was delocalized and rotated to parallel to an applied field showing a martensitic transition.