Nuclear spin relaxation of Li-8 in a thin film of La0.67Ca0.33MnO3
| Autor: | D. J. Arseneau, S. R. Kreitzman, A. Engelbertz, T. J. Parolin, Zaher Salman, H. Saadaoui, Gerald D. Morris, C. D. P. Levy, S. Daviel, P. Morales, Kim H. Chow, R. F. Kiefl, T. A. Keeler, R. Poutissou, J. Y. T. Wei, M. D. Hossain, R. I. Miller, W. A. MacFarlane, D. Wang |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Condensed matter physics Relaxation (NMR) Condensed Matter Physics Electronic Optical and Magnetic Materials Magnetic field chemistry.chemical_compound Condensed Matter::Materials Science Ferromagnetism chemistry Spin wave Strontium titanate Curie temperature Condensed Matter::Strongly Correlated Electrons Electrical and Electronic Engineering Thin film Spin (physics) |
| Zdroj: | PHYSICA B-CONDENSED MATTER 10th International Conference on Muon Spin Rotation, Relaxation and Resonance. 374 |
| ISSN: | 0921-4526 |
| Popis: | We report β -NMR measurements of the nuclear spin relaxation rate ( 1 / T 1 ) in a thin film of La0.67Ca0.33MnO3 (LCMO) using a low-energy beam of spin-polarized 8Li. In a small magnetic field of 150 G, there is a broad peak in 1 / T 1 near the Curie temperature ( T c = 259 K ) and a dramatic decrease in 1 / T 1 at lower temperatures. This is attributed to a critical slowing down of the spin fluctuations near T c and freezing of the magnetic excitations at low temperatures, respectively. In addition, there is a small amplitude, slow relaxing component at high temperatures, which we attribute to 8Li in the SrTiO3 substrate. There is an indication that the spin relaxation rate in the substrate is also peaked at T c due to close proximity to the magnetic film. These results establish that low-energy β -NMR can be used as a probe of magnetic fluctuations in magnetic thin films over a wide range of temperatures. |
| Databáze: | OpenAIRE |
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