6533b7d2fe1ef96bd125e9e9
RESEARCH PRODUCT
Magnetotransport Properties of Thin Films of Magnetic Perovskites
W. WesterburgF. MartinDaniel ReisingerNicole AuthGerhard Jakobsubject
Phase transitionMaterials scienceMagnetoresistanceCondensed matter physicsFerrimagnetismElectrical resistivity and conductivityPhase (matter)Fermi energyHalf-metalManganitedescription
In this article we show magnetotransport of two prototypical (nearly) half metallic perowskites La2/3Ca1/3MnO3 and Sr2FeMoO6. In a half metal the spin polarisation at the Fermi energy is complete and tunneling magnetoresistive devices of high sensitivity can be realized with small external magnetic fields. In the vicinity of the metal-insulator phase transition (MIT) temperature of the manganite an external magnetic field can induce ’colossal’ magnetoresistive effects. In the simple perovskites La1-x Ca x MnO3 the charge transport above the MIT is of polaronic nature. Hall-effect measurements on the compound La0.67Ca0.33MnO3 below the MIT show a compensated Fermi-surface consisting of electron and hole contributions and an unusual quadratic temperature dependence of the resistivity. In Sr2FeMoO6 we found a clear correlation between electrical conductivity and ordered occupation of the Fe, Mo atomic positions. While the low temperature ferrimagnetic phase shows similar transport the high temperature phase stays metallic.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-10-12 |