TbxEr1−xNi5compounds: An ideal model system for competing Ising-XYanisotropy energies
| Autor: | Jung-Hwan Yi, E. G. Gerasimov, Ian P. Swainson, Yu. A. Dorofeev, Mahipal Ranot, Y. Choi, J.-G. Park, Junghwan Park, A. N. Pirogov, A. V. Korolev, Seongsu Lee, A. S. Ermolenko, Andrey Podlesnyak, A. P. Vokhmyanin, A. G. Kuchin |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Physical Review B. 79 |
| ISSN: | 1550-235X 1098-0121 |
| Popis: | We have studied ${\text{Tb}}_{x}{\text{Er}}_{1\ensuremath{-}x}{\text{Ni}}_{5}$ ($x=0$, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 0.925, and 1.0) compounds by using several experimental techniques such as ac-susceptibility, heat-capacity, and neutron-diffraction measurements. All the compounds are found to crystallize in the ${\text{CaCu}}_{5}$-type structure with space group $P6/mmm$. The $a$ axis shows a linear increase with Tb concentration, whereas the $c$ axis remains almost unchanged over the whole doping range. Our neutron-diffraction studies revealed that samples for $0\ensuremath{\le}x\ensuremath{\le}0.8$ have a commensurate magnetic structure with $\mathbf{k}=0$, whereas the two samples on the Tb-rich phase ($x=0.925$ and 1.0) have an incommensurate structure. Of particular interest is that individual Tb and Er moments keep their mutually orthogonal arrangement seen at the end-member compositions over the whole doping range, due to very strong magnetic anisotropy of single-ion nature. We have established a complete magnetic $x\text{\ensuremath{-}}T$ phase diagram of ${\text{Tb}}_{x}{\text{Er}}_{1\ensuremath{-}x}{\text{Ni}}_{5}$ to find that two straight lines of the ordering of the Tb and Er subsystems are persistently seen, which intersect at a tetracritical point. |
| Databáze: | OpenAIRE |
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