https://doi.org/10.1007/s100510050573
Pressure effects in ferromagnetic manganites and carrier scattering by disordered magnetic rare earths
1
Laboratoire Louis Néel, CNRS, BP 166, 38042 Grenoble, France
2
Institute of Metal Physics, Ural Division of the Russian Academy of
Sciences, Ekaterinburg 620219, Russian Federation
3
Institute of Solid State Chemistry, Ural Division of the Russian Academy of
Sciences, Ekaterinburg 620219, Russian Federation
Corresponding author: a pierre@grmag.polycnrs-gre.fr
Received:
15
May
1998
Revised:
6
July
1998
Accepted:
16
July
1998
Published online: 15 December 1998
The influence of hydrostatic pressure
on the transport properties of
(La
Rx)0.67Ca0.33MnO3
(
,Tb) ferromagnetic manganites is investigated. The
enhancement of the Curie temperature
TC under pressure agrees with previous
data. In the paramagnetic range, the resistivity
can be represented by a Mott
localisation law, with a characteristic
temperature T0 decreasing with pressure.
The variation of TC with pressure is compared
to the effect induced by replacing
La by a magnetic rare earth in (LaRx)0.67Sr0.33MnO3
manganites (
, ..., Tm).
The main effect is not related to
the decrease of the mean radius of the cation,
but to an additional scattering by the magnetic moment of the rare earth.
– 72.20.i Conductivity phenomena in semiconductors and insulators
–
62.20.-x Mechanical properties of solids
–
71.30.+h Metal-insulator transitions and
other electronic transitions
PACS: 75.50.Dd – Nonmetallic ferromagnetic materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998
