Common effect of chemical and external pressures on the magnetic properties of RECoPO (RE = La, Pr)
| Autor: | Prando, G., Bonfà, P., Profeta, G., Khasanov, R., Bernardini, F., Mazzani, M., Brüning, E. M., Pal, A., Awana, V. P. S., Grafe, H. -J., Büchner, B., De Renzi, R., Carretta, P., Sanna, S. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 87, 064401 (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.87.064401 |
| Popis: | We report a detailed investigation of RECoPO (RE = La, Pr) and LaCoAsO materials performed by means of muon spin spectroscopy. Zero-field measurements show that the electrons localized on the Pr$^{3+}$ ions do not play any role in the static magnetic properties of the compounds. Magnetism at the local level is indeed fully dominated by the weakly-itinerant ferromagnetism from the Co sublattice only. The increase of the chemical pressure triggered by the different ionic radii of La$^{3+}$ and Pr$^{3+}$, on the other hand, plays a crucial role in enhancing the value of the magnetic critical temperature and can be mimicked by the application of external hydrostatic pressure up to 24 kbar. A sharp discontinuity in the local magnetic field at the muon site in LaCoPO at around 5 kbar suggests a sizeable modification in the band structure of the material upon increasing pressure. This scenario is qualitatively supported by \emph{ab-initio} density-functional theory calculations. Comment: 13 pages, 10 figures |
| Databáze: | arXiv |
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