Issue |
Europhys. Lett.
Volume 45, Number 2, January 1999
|
|
---|---|---|
Page(s) | 256 - 262 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1999-00155-0 | |
Published online | 01 September 2002 |
Extraordinary Hall effect in
and
thin films
Department of Physics and Astronomy, University of Sheffield
Sheffield S3 7RH, UK
Received:
9
June
1998
Accepted:
9
November
1998
The Hall effect of La0.7Ba0.3MnO3
and La0.7Ca0.3MnO3 thin films was measured in magnetic
fields T and for temperatures 10 K
340 K.
In the ferromagnetic phase the slope of the Hall resistivity at zero
magnetic induction rapidly increases with temperature
until a maximum is reached at the Curie temperature TC.
A detailed comparison of the Hall resistivity with the magnetization
facilitates the separation of the ordinary and extraordinary
Hall effect. The ordinary Hall constant
RH shows a jump below TC. The
extraordinary Hall constant RA scales with the zero-field
resistivity. At low temperatures we find a quadratic dependence
of RA on the resistivity crossing over to a linear dependence
at higher temperatures. Whereas the quadratic scaling law in the
ferromagnetic phase can be explained by a conventional side-jump
mechanism, the linear dependence near TC and in the hopping
regime is inconsistent with conventional skew scattering.
The data are compared to a recent theory of the Hall effect
in double-exchange ferromagnets.
PACS: 73.50.Jt – Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects) / 75.50.Cc – Other ferromagnetic metals and alloys / 75.70.Ak – Magnetic properties of monolayers and thin films
© EDP Sciences, 1999
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