تقرير
Local magnetic and geometric structure in Mn-doped La(Fe,Si)13
| العنوان: | Local magnetic and geometric structure in Mn-doped La(Fe,Si)13 |
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| المؤلفون: | Eggert, Benedikt, Lill, Johanna, Günzing, Damian, Pillich, Cynthia, Terwey, Alexandra, Radulov, Ilyia A., Wilhelm, Fabrice, Rogalev, Andrei, Rovezzi, Mauro, Skokov, Konstantin, Ollefs, Katharina, Gutfleisch, Oliver, Gruner, Markus E., Wende, Heiko |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science |
| الوصف: | Magnetic cooling has the potential to replace conventional gas compression refrigeration. Materials such as La(Fe,Si)$_{13}$ exhibit a sizeable first-order magnetocaloric effect, and it is possible to tailor the phase transition towards room temperature by Mn-H-doping, resulting in a large temperature range for operation. Within this work, we discuss variations of the electronic and lattice structure in La(Fe,Si)$_{13}$ with increasing Mn content utilizing X-ray magnetic circular dichroism (XMCD) and extended X-ray absorption fine structure spectroscopy (EXAFS). While XMCD shows a decrease of the magnetic polarization at the Fe K edge, low-temperature EXAFS measurements indicate increased positional disorder in the La environment that is otherwise absent for Fe and Mn. First-principles calculations link the positional disorder to an enlarged Mn-Si distance -- explaining the increased positional disorder in the La surrounding. Comment: 23 pages |
| نوع الوثيقة: | Working Paper |
| الوصول الحر: | http://arxiv.org/abs/2304.03065Test |
| رقم الانضمام: | edsarx.2304.03065 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |