Low-temperature magnetic, thermal, and transport properties of FeSi

Transport and optical properties of FeSi

“…namic investigations [4]. This is particularly relevant here since FeSi is not a line compound and there is evidence that even a small change in chemical composition may play an important role [4]. In this paper, the optical results are discussed together with the DC-transport properties.…”

“…This study was performed on the same sample used for transport, magnetic and thermody-* Corresponding author. namic investigations [4]. This is particularly relevant here since FeSi is not a line compound and there is evidence that even a small change in chemical composition may play an important role [4].…”

“…[3]. A fit to an expression appropriate to a variable-range hopping mechanism is, however, possible in this region [4]. below 5 K suggests that the FeSi sample, far from being a semiconductor, is metallic in character in that temperature regime.…”

“…Its resistivity p(T), displayed in Fig. 1, was measured as a function of temperature between room temperature and 1.5 K, using a standard fourwire low frequency AC technique, with bare platinum or copper wires fixed to the sample by conducting silver paint [4]. As the temperature falls there is a monotonic rise in the resistivity by three and a half orders of magnitude at the lowest measured temperature of 1.5 K. On a linear scale there is a shoulder in the data at T= 120 K, and a tendency to saturation below 10K was observed (see inset of Fig.…”

Tunneling spectroscopy on the correlation effects in FeSi

“…1 One of the most striking features is its magnetic susceptibility, which rises nearly exponentially up to a temperature of approximately 500 K, where it exhibits a broad maximum, and for still higher temperatures, decreases obeying a Curie-Weiss law. 2 The intrinsic magnetic susceptibility, from which a paramagnetic Curie-tail has been subtracted, 3 vanishes below 50 K, and the possibility of a transition to antiferromagnetic order at high temperatures has been ruled out by neutron diffraction, 4 the 57 Fe Mössbauer effect, 3,5 27 Si NMR, 3,6 and ϩ SR ͑Ref.…”