| Autor: |
Schneider, M., Gladun, A., Kreyssig, A., Wosnitza, J., Petzold, V., Rosner, H., Behr, G., Souptel, D., Müller, K.-H., Drechsler, S.-L., Fuchs, G. |
| Jazyk: |
angličtina |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
Journal of Physics: Condensed Matter 20(2008), 175221 |
| Popis: |
For a systematic investigation of the heat- and charge-transport properties of YNi2B2C and HoNi2B2C, single-crystal measurements of the electrical resistivity, the thermal conductivity, and the thermoelectric power were performed on the same samples. For HoNi2B2C, a local maximum of the Lorenz number at 20 K is evidently connected with the occurrence of magnetic fluctuations well above the ordering temperature. For the in-plane thermal conductivity, a kink near the superconducting transition was observed, consistent with an anisotropic gap or a multiband description. For both investigated borocarbides, the electrical resistance is isotropic. In contrast, the thermal conductivity shows a pronounced anisotropy. The thermoelectric power exhibits a minor anisotropy and can be well described by electron-diffusion and phonon-drag contributions over a wide temperature range. Based on an analysis of full-potential local-orbital calculations, a strong influence of the boron z position on the thermoelectric power has been revealed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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