Yu. A. Boikov, I. T. Serenkov, V. I. Sakharov, T. Claeson, A. Kalabukhov, V. V. Afrosimov, “Structure and magneto-transport parameters of partially relaxed and coherently grown La$_{0.67}$Ba$_{0.33}$MnO$_3$ films”, Fizika Tverdogo Tela, 2013, Volume 55, Issue 10,Pages 1928

This article is cited in 4 papers

Magnetism

Structure and magneto-transport parameters of partially relaxed and coherently grown La$_{0.67}$Ba$_{0.33}$MnO$_3$ films

Yu. A. Boikov^a, I. T. Serenkov^a, V. I. Sakharov^a, T. Claeson^b, A. Kalabukhov^b, V. V. Afrosimov^a

^a Ioffe Institute, St. Petersburg
^b Chalmers University of Technology, Sweden

Abstract: X-ray diffraction (XRD) and medium-energy ion scattering (MEIS) have been used to reveal distortions in the crystal lattice of La$_{0.67}$Ba$_{0.33}$MnO$_3$ (LBMO) films formed in relaxation of mechanical stresses. The LBMO films 25 nm thick have been prepared by laser deposition. The XRD and MEIS data obtained suggest that biaxially and mechanically elastically stressed LBMO layers grow coherently on LSATO substrates, whose crystal lattice parameter differs only weakly from the corresponding LBMO parameter, whereas in the bulk of manganite films grown on LaAlO$_3$ substrates, stresses relax partially. Stresses do not relax in the LBMO interface about 4 nm thick adjoining LaAlO$_3$. The electro- and magneto-transport parameters of partially relaxed LBMO films have been compared with those obtained for coherently grown manganite films with approximately the same tetragonal distortion of the lattice cell ($a_\perp/a_\parallel$ = 1.024–1.030; $a_\parallel$ and $a_\perp$ are the unit cell parameters in the substrate plane and normal to it, respectively). At temperatures substantially lower than the Curie temperature, the electrical resistivity $\rho$ of LBMO films fits the relation $\rho=\rho_0+\rho_1T^2+\rho_2(H)T^{4.5}$; the coefficients $\rho_0$ and $\rho_1$ do not depend on temperature $T$ and magnetic field, and $\rho_2$ does not depend on temperature but almost linearly decreases with increasing magnetic field strength $H$. The coefficient $\rho_2$ for partially relaxed LBMO films is substantially larger than that for coherently grown manganite layers.

Received: 11.03.2013