2016/06/07 by Shirin Mozaffari, Samaresh Guchhait, John T. Markert +1 · 8 citations
Materials Science · Physics and Astronomy · #Electrical resistivity and conductivity #Electronic and Structural Properties of Oxides #Field dependence #Kondo effect #Magnetic and transport properties of perovskites and related materials #Magnetoresistance #Oxygen #Rare-earth and actinide compounds #Saturation (graph theory) #Scattering #Torr #Weak localization #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1088/1361-648x/aa7f43
published in Journal of Physics Condensed Matter 29(39), 395002 (IOP Publishing) · 8 pages, 5 figures
arxiv created 2016/06/07 · openalex created_date 2016/06/24 · openalex publication_date 2017/07/12 · arxiv updated 2017/10/30 · openalex updated_date 2026/08/05
substrates. Resistivity measurements show an increase in the sheet resistance as [Formula: see text] is increased. The saturation of the sheet resistance down to 0.3 K is consistent with Kondo theory for [Formula: see text] torr. Resistivity data fits indicate Kondo temperatures of 16-18 K. For the [Formula: see text] sample, we measured a moderate positive magnetoresistance (MR) due to a strong spin-orbit (SO) interaction at low magnetic fields that evolves into a larger negative MR at high fields due to the Kondo effect. Analysis of the MR data permitted the extraction of the SO interaction critical field for the [Formula: see text] torr interface ([Formula: see text] T). We observed high positive MR for the least oxygenated sample, where a fraction of the n-type carriers are derived from oxygen vacancies and possible cation interdiffusion; for this [Formula: see text] torr sample, Hall effect data indicate a thick conducting layer. Its extremely high MR (∼[Formula: see text]) is attributed to classical behavior due to a distribution of mobilities.