Article citationsMore>>

Bocher, L., Popova, E., Nolan, M., Gloter, A., Chikoidze, E., March, K., Warot-Fonrose, B., Berini, B., Stéphan, O., Keller, N. and Dumont, Y. (2013) Direct Evidence of Fe2+/Fe3+ Charge Ordering in the Ferrimagnetic Hematite-Ilmenite Fe1.35Ti0.65 O3-δ Thin Films. Physical Review Letters, 111, Article ID: 167202.
http://dx.doi.org/10.1103/PhysRevLett.111.167202

has been cited by the following article:

• TITLE: Large Room Temperature Magneto-Resistance in Magnetically Disordered Fe1.5Ti0.5O3-δ Thin Films

  AUTHORS: Ekaterine Chikoidze, Yves Dumont, Elena Popova, Niels Keller, Andrey Shumilin, Veniamin Kozub, Benedicte Warot-Fonrose

  KEYWORDS: PACS Numbers: 73.50.-h. Transport Processes in Thin Films, 72.20.Ee Hopping Transport, 75.47.Lx Magnetic Oxides, 75.70.Ak Magnetic Properties of Monolayers and Thin Films

  JOURNAL NAME: World Journal of Condensed Matter Physics, Vol.4 No.4, November 27, 2014

  ABSTRACT: Electronic transport properties of magnetically disordered R(-3)c phase Fe1.5Ti0.5O3-δ thin films epitaxially grown on Al2O3(0001) substrates have been studied. The measured magnetization in configurations with the magnetic field perpendicular and parallel to the film plane shows weak values of 0.1μB/formula compared to the theoretical value of 2μB/formula and a strong anisotropy with no saturation in perpendicular configuration. These properties are associated with the ato- mic scale disorder of Ti/Fe ions along c-axis. At zero-magnetic field and within the temperature range of 80 K to 400 K, the conduction mechanism appears to be Efros-Shklovskii variable range hopping with a carrier localization length of ξ0= 0.86nm. Magneto-resistance (MR) is positive in perpendicular configuration, while it is negative in parallel configuration, with significant values of MR = 27%- 37% at room temperature at 9 Tesla. Electron localization lengths were deduced from experiment for different external magnetic fields. The origin of magneto-resistance observed in experiment, is discussed.