Hard x-ray photoemission spectroscopy of GdNi and HoNi
| العنوان: | Hard x-ray photoemission spectroscopy of GdNi and HoNi |
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| المؤلفون: | Daniel Malterre, Y. F. Liao, Yi Ying Chin, F. M. F. de Groot, Ku-Ding Tsuei, R. Nirmala, Ashish Chainani, C. W. Chuang |
| المصدر: | Physical Review B. 102 |
| بيانات النشر: | American Physical Society (APS), 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | symbols.namesake, Materials science, Condensed matter physics, Photoemission spectroscopy, Binding energy, Fermi level, Density of states, symbols, Curie temperature, Electronic structure, Coupling (probability), Spectroscopy |
| الوصف: | We study the electronic structure of GdNi and HoNi, which are magnetic materials with a Curie temperature ${T}_{c}=69$ and ${T}_{c}=36\phantom{\rule{0.28em}{0ex}}\mathrm{K}$, respectively. These materials are useful for magnetic refrigerator applications at low temperature as they exhibit a large magnetocaloric effect near ${T}_{c}$. We have used hard x-ray photoemission spectroscopy (HAXPES) to investigate the core-level and valence-band electronic states of GdNi and HoNi. HAXPES measurements of the Gd and Ho $3d, 4d, 4p, 5p$, and $4s$ core-level spectra have been compared with atomic multiplet calculations of ${\mathrm{Gd}}^{3+}$ and ${\mathrm{Ho}}^{3+}$ ionic configurations. The good match between the experimental and calculated spectra clarify the important role of spin-orbit coupling, as well as Coulomb and exchange interactions in the intermediate-coupling scheme. The core-level spectra also show plasmons in addition to the atomic multiplets. The Gd and Ho $4s$ spectra show clear evidence of exchange splitting. The Ni $2p$ and $3s$ spectra of GdNi and HoNi show a correlation satellite at a binding energy of 7 eV above their main peaks. The Ni $2p$ and Ni $3s$ spectra could be reproduced using charge transfer multiplet calculations. Valence-band HAXPES of GdNi and HoNi shows that the Gd $4f$ and Ho $4f$ features are also consistent with atomic multiplets and occur at high binding energies away from the Fermi level. The Ni $3d$ density of states are spread from the Fermi level to about 3 eV binding energy. The results indicate a partially filled Ni $3d$ band and show that the charge transfer model is not valid for describing the electronic structure of GdNi and HoNi. |
| تدمد: | 2469-9969 2469-9950 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::7a4cd940be51fec659af521c264018df https://doi.org/10.1103/physrevb.102.165127 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........7a4cd940be51fec659af521c264018df |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24699969 24699950 |
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