Field-Tuning of the electron and hole populations in the ruthenate Bi_3Ru_3O_11

Details Field-Tuning of the electron and hole populations in the ruthenate Bi_3Ru_3O_11 Field-Tuning of the electron and hole populations in the ruthenate Bi_3Ru_3O_11

2003-05-19

arxiv.org/abs/cond-mat/0305451v2

Europhys. Lett. 63, 860 (2003).

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 6 figures, reference added

Scientific paper

10.1209/epl/i2003-00599-0

Experiments on the Hall coefficient R_H and heat capactity C reveal an unusual, compensated electronic ground state in the ruthenate Bi_3Ru_3O_11. At low temperature T, R_H decreases linearly with magnetic field |H| 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 K, the curve C(T)/T vs. T^2 shows an anomalous flattening consistent with a rapidly growing Sommerfeld parameter \gamma(T). We discuss shifts of the electron and hole chemical potentials by H to interpret the observed behavior of R_H.

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