Journal ArticleDOI
Liquid MnTe: An example of a Mott-Hubbard liquid semiconductor
Adrian C Barnes,John E. Enderby +1 more
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In this article, a series of experiments performed in their laboratory have shown that liquid alloy systems of the form MTe (M is a transition metal other than Mn) combine salt-like structural order with a high electrical conductivity.Abstract:
A series of experiments performed in our laboratory have shown that liquid alloy systems of the form MTe (M is a transition metal other than Mn) combine salt-like structural order with a high electrical conductivity. This apparent contradiction can be resolved in terms of the Mott transition, that is to say, the d-bands associated with M are delocalized and are therefore able to contribute significantly to the conductivity. The situation for liquid MnTe is totally different. Here, the salt-like structural order is associated with a very low electrical conductivity because the splitting of the two sub-d-bands is sufficiently large to give a deep pseudogap in the density of states. Furthermore, since the splitting of the d-bands is an intra-atomic effect, the pseudogap should be essentially independent of temperature. We therefore have an ideal system for checking the validity of the Mott formula for the conductivity σ of liquid semiconductor, σ = σOe−EC−EF/kT We can also determine σO by a combination of measurements of σ and the thermopower S. Results for S and are presented for a series of liquid alloys at and close to the stoichiometric composition MnTe and the results interpreted in terms of Eq. (1).read more
Citations
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Journal ArticleDOI
Some considerations relating to a minimum metallic conductivity
TL;DR: Although in principle no minimum metallic conductivity σmin exists for disordered metallic systems, there appear to be many systems for which, when the zero-temperature conductivity has the valu....
Journal ArticleDOI
The electrical properties of liquid Mn–Te alloys
TL;DR: In this paper, the electrical conductivity and the thermoelectric power have been measured for liquid Mn x Te 1−x with 0x0·5 and the experimental data can be used directly to test the form of the energy-dependent conductivity close to the valence band mobility edge.
References
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Electronic processes in non-crystalline materials
TL;DR: The Fermi Glass and the Anderson Transition as discussed by the authorsermi glass and Anderson transition have been studied in the context of non-crystalline Semiconductors, such as tetrahedrally-bonded semiconductors.
Journal ArticleDOI
Optical properties and electronic structure of crossroads material MnTe
TL;DR: In this paper, an energy level model for the rocksalt manganese chalcogenides with a measurement of 1.3 eV for the optical gap of NiAs-structured MnTe was proposed.
Journal ArticleDOI
The thermoelectric power of liquid Ag-Au
R. A. Howe,J. E. Enderby +1 more
TL;DR: The absolute thermoelectric power, S, of the liquid system Ag-Au has been measured as a function of composition as mentioned in this paper, and the theory correctly predicts the composition dependence of S.
Journal ArticleDOI
The structure and electrical properties of liquid semiconductors. II. Electron transport in liquid Ni-Te alloys
TL;DR: In this paper, the resistivity and thermoelectric power of liquid Ni-Te alloys have been measured as a function of temperature over a wide range of compositions and a unified model for the atomic and electronic structure is proposed.
Journal ArticleDOI
The liquid alloy system Mn x Te1-x
TL;DR: In this paper, the electrical conductivity of liquid Mn x Te1-x (0≤x£0·5) has been measured as a function of x and it was shown that the semi-metallic nature of liquid Te is gradually eliminated as x is increased and that at stoichiometry (x = 0·5), MnTe is a liquid semiconductor.