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Article Dans Une Revue Solid State Communications Année : 1998

The blue shift of the plasma edge of a ferromagnetic semimetal

Résumé

Magnetic measurements on nearly stoichiometric TbN single crystals reveal metamagnetic behavior with a TN of 31 K. Excess carriers due to nonstoichiometry make the crystals ferromagnetic with TC = 48 K, a fact which has been revealed by elastic neutron scattering measurements in zero applied field. The compound is a self-compensated semimetal, in which the valence p band of nitrogen has a maximum at the Γ point of the Brillouin zone and the conduction d band has a minimum at the X point. A slight overlap of both bands yields about 1021 carriers cm−3. The optical reflectivity and the thermal expansion coefficient have been measured on the ferromagnetic compositions. The plasma edge of the free carriers exhibits a blue shift upon cooling below TC, following a spin correlation function. This is mainly due to an exchange splitting of the conduction d band.

Dates et versions

hal-03857303 , version 1 (17-11-2022)

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P. Wachter, F. Bommeli, L. Degiorgi, P. Burlet, F. Bourdarot, et al.. The blue shift of the plasma edge of a ferromagnetic semimetal. Solid State Communications, 1998, 105 (11), pp.675-680. ⟨10.1016/S0038-1098(97)10233-2⟩. ⟨hal-03857303⟩
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