Eur. Phys. J. B 19, 409-415 (2001)
https://doi.org/10.1007/s100510170317

Isotope effect for transport and magnetic properties of La_0.35Pr_0.35Ca_0.3MnO₃ thin films

¹ Russian Research Center "Kurchatov Institute", Kurchatov sqr. 1, Moscow 123182, Russia
² Department of Chemistry, Moscow State University, Vorobievy Gory, Moscow 119899, Russia
³ Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
⁴ Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, Izhorskaya str. 13/19, Moscow 127412, Russia

Corresponding author: ^a babushkina@imp.kiae.ru

Received: 11 February 2000
Revised: 13 September 2000
Published online: 15 February 2001

Abstract

The effect of isotope substitution on electrical resistivity, magnetoresistance, and ac magnetic susceptibility was studied for La_0.35Pr_0.35Ca_0.3MnO₃ epitaxial thin films deposited onto LaAlO₃ and SrTiO₃ substrates. For the films on LaAlO₃, the isotope substitution resulted in the reversible transition from a metal-like to insulating state. The applied magnetic field () transformed the sample with ¹⁸O back to the metallic state. The films on SrTiO₃ remained metallic at low temperatures for both ¹⁶O and ¹⁸O, but the shift of the resistivity peak corresponding to onset of metallic state exceeded 63 K after substitution. The temperature dependence of both resistivity and magnetic susceptibility was characterized by hysteresis, especially pronounced in the case of the films on LaAlO₃. Such a behavior gives certain indications of the phase separation characteristic of interplay between ferromagnetism and charge ordering.