Titanium-iii warwickites: a family of one-dimensional disordered magnetic systems
| Autor: | Renato B. Guimarães, J. V. Valarelli, A. H. Lacerda, Mucio A. Continentino, J. C. Fernandes, H. A. Borges |
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| Rok vydání: | 1994 |
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| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | We present x-ray, susceptibility, and magnetization (up to 18 T) measurements in the compound ${\mathrm{MgTiOBO}}_{3}$, which forms in the structure known as warwickite. This structure is characterized by the presence of ribbons along the c axis where the metallic ions are located. This system is magnetic since the Ti ions are in the valence state ${\mathrm{Ti}}^{3+}$ with the electronic configuration 3${\mathit{d}}^{1}$. Its susceptibility has a temperature dependence, at low temperatures, given by \ensuremath{\chi}(T) \ensuremath{\propto} ${\mathit{T}}^{\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\alpha}}}$, with the exponent \ensuremath{\alpha}\ensuremath{\approxeq}0.83. The low-temperature behavior of the magnetization, as a function of field, is described by m \ensuremath{\propto} ${\mathit{H}}^{\ensuremath{\gamma}}$ with \ensuremath{\gamma}\ensuremath{\approxeq}1-\ensuremath{\alpha}. These results, together with the x-ray measurements, allow us to identify this material as belonging to a family of inorganic, one-dimensional, disordered magnetic systems. |
| Databáze: | OpenAIRE |
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