Volume 63, Number 6, September 2003
|Page(s)||860 - 866|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 November 2003|
Field tuning of the electron and hole populations in the ruthenate
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
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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