Magnetic ordering and spin-reorientation transitions inTbCo3B2
| Autor: | Hanania Ettedgui, Mordechai Melamud, El’ad N. Caspi, M. Dubman, Hagai Shaked, Lukas Keller |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Physical Review B. 72 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.72.024446 |
| Popis: | The magnetic structure of the compound $\mathrm{Tb}{\mathrm{Co}}_{3}{\mathrm{B}}_{2}$ has been studied in the temperature range $1.5\phantom{\rule{0.3em}{0ex}}\mathrm{K}\ensuremath{\leqslant}T\ensuremath{\leqslant}300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ by means of neutron powder diffraction, magnetization, magnetic ac susceptibility, and heat capacity measurements. The compound is of hexagonal symmetry and is paramagnetic at $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, undergoes a magnetic $\mathrm{Co}\text{\ensuremath{-}}\mathrm{Co}$ ordering transition at $\ensuremath{\sim}170\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and a second magnetic $\mathrm{Tb}\text{\ensuremath{-}}\mathrm{Tb}$ ordering transition at $\ensuremath{\sim}30\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The latter induces a spin-reorientation transition, in which the magnetic axis rotates from the $c$ axis toward the basal plane. Below this transition a symmetry decrease ($\ensuremath{\gamma}$ magnetostriction) sets in, leading to an orthorhombic distortion of the crystal lattice. The crystal and magnetic structures and interactions and their evolution with temperature are discussed using a microscopic physical model. |
| Databáze: | OpenAIRE |
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