Strong magnetoelastic effect in CeCo1−xFexSi as Néel order is suppressed
| Autor: | Pablo S. Cornaglia, Daniel Garcia, C. Geibel, Pablo Pedrazzini, D. Betancourth, Sergio Encina, Boris Maiorov, V. F. Correa, N. Caroca Canales, J. G. Sereni, A. G. Villagrán Asiares |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Valence (chemistry) Condensed matter physics Absorption spectroscopy Doping Magnetostriction 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ion Magnetization 0103 physical sciences Antiferromagnetism Inverse magnetostrictive effect 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 100 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.100.184409 |
| Popis: | A very strong magnetoelastic effect in the ${\mathrm{CeCo}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}\mathrm{Si}$ alloys is reported. The strength of the magnetostrictive effect can be tuned upon changing $x$. The moderate low-temperature linear magnetostriction observed at low Fe concentrations becomes very large $(\frac{\mathrm{\ensuremath{\Delta}}L}{L}\left(16T,2K\right)=\phantom{\rule{4pt}{0ex}}3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3})$ around the critical concentration ${x}_{c}\ensuremath{\approx}0.23$ at which the long-range antiferromagnetic order vanishes. Upon increasing doping through the nonmagnetic region $(xg{x}_{c})$, the magnetostriction strength gradually weakens again. The interplay between magnetic order and the Kondo screening appears to cause an enhanced valence susceptibility slightly changing the Ce ions valence, ultimately triggering the large magnetostriction observed around the critical concentration. Previous studies of the evolution of the lattice parameters with $x$ as well as magnetization and x-ray absorption spectroscopy measurements support this hypothesis. |
| Databáze: | OpenAIRE |
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