| Autor: |
M G Townsend, L J Ripley, J L Horwood, R. J. Tremblay |
| Rok vydání: |
1971 |
| Předmět: |
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| Zdroj: |
Journal of Physics C: Solid State Physics. 4:598-606 |
| ISSN: |
0022-3719 |
| DOI: |
10.1088/0022-3719/4/5/010 |
| Popis: |
Hexagonal nickel sulphide shows a metal to semiconductor first order phase transition at a temperature TN which depends on sulphur content. Thermoelectric power, conductivity, Hall and magnetic susceptibility measurements have been made on five single crystals of compositions ranging from NiS-NiS1.02 in the temperature range 82-300 K. The results suggest that below TN the Ni 3d states are essentially localized or form a narrow band. The predominant mechanism of conduction is by holes in a wide band. The discontinuity in conductivity at TN is most likely due primarily to a change in mobility. Impurity band conduction occurs at low temperatures. The susceptibility curves have a markedly different shape from that normally expected for an antiferromagnet. This results from the first order character of the phase transition at TN. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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