Charge-carrier density collapse in and epitaxial thin films
| Autor: | Gerhard Jakob, F. Martin, W. Westerburg, J.A.A.J. Perenboom, P.J.M. van Bentum |
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| Rok vydání: | 2000 |
| Předmět: |
Materials science
Condensed matter physics Transition temperature Atmospheric temperature range Condensed Matter Physics Magnetic hysteresis Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Magnetization Ferromagnetism Electrical resistivity and conductivity Hall effect Condensed Matter::Strongly Correlated Electrons Charge carrier |
| Zdroj: | The European Physical Journal B. 14:509-513 |
| ISSN: | 1434-6028 |
| Popis: | We measured the temperature dependence of the linear high field pH of La0.67Ca0.33MnO3 Tc = 232K) and La0.67Sr0.33MnO3 Tc = 345K) thin films in the temperature range from 4 K up to 360 K in magnetic fields up to 20 T. At low temperatures we find a charge-carrier density of 1.3 and 1.4 holes per unit cell for the Ca- and Sr-doped compound, respectively. In this temperature range electron-magnon scattering contributes to the longitudinal resistivity. At the ferromagnetic transition temperature Tc a dramatic drop in the number of charge-carriers n down to 0.6 holes per unit cell, accompanied by an increase in unit cell volume, is observed. Corrections of the Hall data due to a non saturated magnetic state will lead a more pronounced charge-carrier density collapse. |
| Databáze: | OpenAIRE |
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