2003/08/04 by А. Н. Лавров, A. N. Lavrov, I. Tsukada +1 · 5 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.68.094506
published as Phys. Rev. B 68, 094506 (2003) · 10 pages, 10 figures, accepted for publication in Phys. Rev. B
arxiv created 2003/08/04 · openalex publication_date 2003/09/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report a detailed study of the electric-field dependence of the normal-state conductivity in La_2\ensuremath-xSrxCuO4 thin films for two concentrations of doped holes, x=0.01 and 0.06, where formation of diagonal and vertical charged stripes was recently suggested. In order to elucidate whether high electric fields are capable of depinning the charged stripes and inducing their collective motion, we have measured current-voltage characteristics for various orientations of the electric field with respect to the crystallographic axes. However, even for the highest possible fields (\ensuremath∼1000V/cm for x=0.01 and \ensuremath∼300V/cm for x=0.06) we observed no nonlinear conductivity features except for those related to the conventional Joule heating of the films. Our analysis indicates that Joule heating, rather than collective electron motion, may also be responsible for the nonlinear conductivity observed in some other two-dimensional transition-metal oxides as well. We discuss that a possible reason why moderate electric fields fail to induce a collective stripe motion in layered oxides is that fairly flexible and compressible charged stripes can adjust themselves to the crystal lattice and individual impurities, which makes their pinning much stronger than in the case of conventional rigid charge-density waves.