Temperature dependence of carrier-nucleus interactions in semimetallic antimony
| Autor: | M. J. R. Hoch, J. M. Keartland, G.J. Hill |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Materials science
Condensed matter physics Spin–lattice relaxation chemistry.chemical_element Electronic structure Atmospheric temperature range Condensed Matter Physics Semimetal Electronic Optical and Magnetic Materials symbols.namesake Antimony chemistry Quadrupole symbols Electrical and Electronic Engineering Nuclear quadrupole resonance Debye model |
| Zdroj: | Physica B: Condensed Matter. 279:319-333 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/s0921-4526(99)00796-6 |
| Popis: | Previous 121Sb relaxation measurements in pure antimony metal show a typical metallic (Korringa) temperature dependence of the nuclear spin}lattice relaxation rate at low temperatures, followed by a quadratic temperature dependence above the Debye temperature. This deviation was previously ascribed to the onset of signi"cant phononinduced relaxation. In this paper, nuclear spin}lattice relaxation of both 121Sb and 123Sb has been investigated over the temperature range 4}435 K using pulsed NQR. These two-isotope data allow for a decisive investigation of the importance of quadrupolar relaxation mechanisms over a wide temperature range. Our results show that the ratio of quadrupole to magnetic transition rates changes from a fraction of a percent to order 1% as the temperature is increased through the Debye temperature, but this change cannot account for the observed deviation from Korringa behaviour. The relaxation data, therefore, suggest a signi"cant temperature dependence of the carrier properties of antimony. Possible explanations for the high-temperature behaviour are discussed in terms of the electronic structure of antimony. ( 2000 Elsevier Science B.V. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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