| Issue |
Europhys. Lett.
Volume 63, Number 6, September 2003
|
|
|---|---|---|
| Page(s) | 860 - 866 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00599-0 | |
| Published online | 01 November 2003 | |
Field tuning of the electron and hole populations
in the ruthenate 
1
Department of Physics, Princeton University - Princeton, NJ 08544, USA
2
Department of Chemistry, Princeton University - Princeton, NJ 08544, USA
3
Los Alamos National Laboratory - Los Alamos, NM 87544, USA
4
Princeton Materials Institute, Princeton University - Princeton, NJ 08544, USA
Received:
15
May
2003
Accepted:
4
July
2003
Experiments on the Hall coefficient 
and heat
capacity C reveal an unusual, compensated electronic ground
state in the ruthenate . At low temperature
T, decreases linearly with magnetic field 
for fields larger than the field scale set by the Zeeman energy.
The results suggest that the electron and hole populations are
tuned by H in opposite directions via coupling of the spins to
the field. As T is decreased below 5
, the curve 
vs. T2 shows an anomalous flattening consistent with
a rapidly growing Sommerfeld parameter 
. We discuss
shifts of the electron and hole chemical potentials by H to
interpret the observed behavior of .
PACS: 72.15.-v – Electronic conduction in metals and alloys / 72.60.+g – Mixed conductivity and conductivity transitions / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EDP Sciences, 2003
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