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

Wei-Li Lee·M. K. Hass·G. Lawes·A. P. Remirez·R. J. Cava·N. P. Ong
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Abstract

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 γ(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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Wei-Li Lee, M. K. Hass, G. Lawes, A. P. Remirez, R. J. Cava, N. P. Ong. 2003-06-11. Field-Tuning of the electron and hole populations in the ruthenate Bi_3Ru_3O_11. https://doi.org/10.1209/epl%2Fi2003-00599-0

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