Academic Journal
Microscopic magnetic properties of the ferromagnetic superconductor UCoGe reviewed by x-ray magnetic circular dichroism
| العنوان: | Microscopic magnetic properties of the ferromagnetic superconductor UCoGe reviewed by x-ray magnetic circular dichroism |
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| المؤلفون: | Taupin, Mathieu, Sanchez, Jean-Pierre, Brison, Jean-Pascal, Aoki, Dai, Lapertot, Gerard, Wilhelm, Fabrice, Rogalev, Andrei |
| المساهمون: | Instrumentation, Material and Correlated Electrons Physics (IMAPEC), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Université Grenoble Alpes 2016-2019 (UGA 2016-2019 )-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 )-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Magnétisme et Diffusion Neutronique (MDN), Modélisation et Exploration des Matériaux (MEM), Tohoku University Sendai, European Synchrotron Radiation Facility (ESRF), ANR-09-BLAN-0146,SINUS(2009), European Project: 258239,EC:FP7:ERC,ERC-2010-StG_20091028,NEWHEAVYFERMION(2010) |
| المصدر: | ISSN: 1098-0121 ; EISSN: 1550-235X. |
| بيانات النشر: | CCSD American Physical Society |
| سنة النشر: | 2015 |
| المجموعة: | Université Grenoble Alpes: HAL |
| مصطلحات موضوعية: | Self-Absorption, Band Magnetism, URhGe, Orbital Magnetization, PACS number(s): 75.30.Mb, 75.25.−j, 78.70.Dm, [PHYS]Physics [physics] |
| الوصف: | International audience ; The ferromagnetic superconductor UCoGe has been investigated by high field x-ray magnetic circular dichroism (XMCD) at the U $M_{4,5}$ and Co/Ge $K$ edges. The analysis of the branching ratio and XMCD at the U $M_{4,5}$ edges reveals that the U 5$f$ electrons count is close to 3. The orbital (~0.7 $\mu_{\beta}$) and spin (~$-$0.30$\mu_{\beta}$) moments of U at 2.1 K and 17 T (H$\parallel$c) have been determined. Their ratio (~$-$2.3) suggests a significant delocalization of the 5 $f$ electron states. The similar field dependences of the local U/Co and the macroscopic magnetization indicate that the Co moment is induced by the U moment. The XMCD at the Co/Ge $K$ edges reveal the presence of small Co 4$p$ and Ge 4$p$ orbital moments parallel to the macroscopic magnetization. In addition, the Co $3$d moment is estimated to be at most of the order of 0.1$\mu_{\beta}$ at 17 T. Our results rule out the possibility of an unusual polarizability of the U and Co moments as well as their antiparallel coupling. We conclude that the magnetism which mediates the superconductivity in UCoGe is driven by U. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | info:eu-repo/grantAgreement/EC/FP7/258239/EU/Novel materials and extreme conditions to open new frontiers in heavy fermion physics/NEWHEAVYFERMION |
| DOI: | 10.1103/PhysRevB.92.035124 |
| الاتاحة: | https://cea.hal.science/cea-01745393 https://doi.org/10.1103/PhysRevB.92.035124 |
| رقم الانضمام: | edsbas.70767F6 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1103/PhysRevB.92.035124 |
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