https://doi.org/10.1007/s100510170317
Isotope effect for transport and magnetic properties of La0.35Pr0.35Ca0.3MnO3 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
The effect of isotope substitution on electrical resistivity,
magnetoresistance, and ac magnetic susceptibility was studied for La0.35Pr0.35Ca0.3MnO3
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.
PACS: 75.30.Vn – Colossal magnetoresistance / 73.50.Jt – Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects) / 31.30.Gs – Hyperfine interactions and isotope effects, Jahn-Teller effect
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001