| Issue |
Europhys. Lett.
Volume 54, Number 3, May 2001
|
|
|---|---|---|
| Page(s) | 401 - 406 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00255-3 | |
| Published online | 01 December 2003 | |
Enhancement of anomalous Hall effect in a filling-changed pyrochlore-type molybdate
1
Department of Applied Physics,
University of Tokyo - Tokyo 113-8656, Japan
2
Correlated Electron Research Center (CERC)
and Joint Research Center
for Atom Technology (JRCAT) - Tsukuba 305-0046, Japan
Received:
9
October
2000
Accepted:
22
February
2001
Anomalous Hall effect has been investigated for metallic ferromagnets
with a pyrochlore lattice, (Sm
Cax)2Mo2O7, with
x=0 and 0.1. While longitudinal conductivity and magnetization
undergo little change upon the partial Ca substitution, the anomalous
Hall effect or transverse conductivity increasing toward low
temperature is drastically enhanced. Comparison with a Y-doped
compound (Sm0.9Y0.1)2Mo2O7 has revealed that the
change of band filling is essential for the large variation in the
transverse conductivity. By measurements of AC susceptibility, a
glassy nature is indicated for the ferromagnetic state of the Ca-doped
compound, which arises perhaps from an increased tilting angle of Mo
spins. The resultant enhancement of the spin chirality and the
associated Berry phase are likely responsible for the drastic increase
of the anomalous Hall effect.
PACS: 75.50.-y – Studies of specific magnetic materials / 72.20.My – Galvanomagnetic and other magnetotransport effects / 72.15.Gd – Galvanomagnetic and other magnetotransport effects
© EDP Sciences, 2001
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