Pressure-induced Transition of the Sublattice Magnetization inEuCo2P2: Change from Local MomentEu(4f)to ItinerantCo(3d)Magnetism
| Autor: | Manfred Reehuis, H. Micklitz, Mohsen M. Abd-Elmeguid, M. Chefki, W. Schlabitz, W. Jeitschko, C. Huhnt |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 80:802-805 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | Antiferromagnetism in ${\mathrm{EuCo}}_{2}{\mathrm{P}}_{2}$ ( ${\mathrm{ThCr}}_{2}{\mathrm{Si}}_{2}$-type structure) is due to ordering of the ${\mathrm{Eu}}^{2+}(^{8}S_{7/2})$ sublattice moments $({T}_{N}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}66.5\mathrm{K})$ while the $\mathrm{Co}(3d)$ sublattice does not carry any magnetic moment. ${\mathrm{EuCo}}_{2}{\mathrm{P}}_{2}$ undergoes a pressure-induced isostructural phase transition at ${p}_{c}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3.1\mathrm{GPa}$. ${}^{151}$Eu high-pressure M\"ossbauer experiments $(0\ensuremath{\le}p\ensuremath{\le}5\mathrm{GPa})$ reveal a valence transition of Eu from ${\mathrm{Eu}}^{2+}$ to nonmagnetic ${\mathrm{Eu}}^{3+}(^{7}F_{0})$ at $pg{p}_{c}$ with the consequence that the disappearance of the $\mathrm{Eu}(4f)$ sublattice magnetism is accompanied by a simultaneous appearance of $\mathrm{Co}(3d)$ sublattice magnetism $({T}_{N}^{*}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}260\mathrm{K})$. The latter is explained by the filling of the $3d$ states. |
| Databáze: | OpenAIRE |
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