Possible room-temperature signatures of unconventional 4f -electron quantum criticality in YbMn6Ge6−xSnx
| العنوان: | Possible room-temperature signatures of unconventional 4f -electron quantum criticality in YbMn6Ge6−xSnx |
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| المؤلفون: | François Baudelet, Daniel Malterre, L. Nataf, A. Magnette, L. Eichenberger, Thomas Mazet, Romain Sibille |
| المصدر: | Physical Review B. 101 |
| بيانات النشر: | American Physical Society (APS), 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Physics, Condensed Matter::Materials Science, Magnetization, Valence (chemistry), Condensed matter physics, Magnetic moment, Absorption spectroscopy, Magnetic circular dichroism, Doping, Electron, XANES |
| الوصف: | We investigate the Sn composition dependence of the Yb valence and local magnetization in ${\mathrm{YbMn}}_{6}{\mathrm{Ge}}_{6\ensuremath{-}x}{\mathrm{Sn}}_{x}$ ($4.25\ensuremath{\le}x\ensuremath{\le}5.80$) using x-ray absorption spectroscopy (XANES) and x-ray magnetic circular dichroism at the Yb ${L}_{3}$ edge. In these materials, where Mn is ferromagnetically ordered, we observe a decrease of the Yb valence upon reducing the chemical pressure by Sn doping and a suppression of the Yb magnetic moment for strongly hybridized $4f$ states ($\ensuremath{\nu}\ensuremath{\sim}2.77$). In the vicinity of the Yb magnetic instability (${x}_{c}\ensuremath{\sim}5.23$), a remarkably sharp peak is observed in the composition dependence of the valence and magnetic moment at low temperature, which is reminiscent of enhanced valence and magnetic susceptibilities predicted by recent theories on unconventional quantum criticality. This anomaly is also present in the room-temperature XANES signal, suggesting that rare-earth intermetallics with a magnetized $3d$ sublattice form a distinct group of heavy-fermion metals where the high energy of the exchange interactions can bring quantum criticality up to high temperature. |
| تدمد: | 2469-9969 2469-9950 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::3c967c38fcd704a7f508e11616103724 https://doi.org/10.1103/physrevb.101.020408 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........3c967c38fcd704a7f508e11616103724 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24699969 24699950 |
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