تقرير
Probing magnetism in the vortex phase of PuCoGa$_5$ by X-ray magnetic circular dichroism
| العنوان: | Probing magnetism in the vortex phase of PuCoGa$_5$ by X-ray magnetic circular dichroism |
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| المؤلفون: | Magnani, N., Eloirdi, R., Wilhelm, F., Colineau, E., Griveau, J. -C., Shick, A. B., Lander, G. H., Rogalev, A., Caciuffo, R. |
| المصدر: | Phys. Rev. Lett. 119, 157204 (2017) |
| سنة النشر: | 2017 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | We have measured X-ray magnetic circular dichroism (XMCD) spectra at the Pu $M_{4,5}$ absorption edges from a newly-prepared high-quality single crystal of the heavy fermion superconductor $^{242}$PuCoGa$_{5}$, exhibiting a critical temperature $T_{c} = 18.7~{\rm K}$. The experiment probes the vortex phase below $T_{c}$ and shows that an external magnetic field induces a Pu 5$f$ magnetic moment at 2 K equal to the temperature-independent moment measured in the normal phase up to 300 K by a SQUID device. This observation is in agreement with theoretical models claiming that the Pu atoms in PuCoGa$_{5}$ have a nonmagnetic singlet ground state resulting from the hybridization of the conduction electrons with the intermediate-valence 5$f$ electronic shell. Unexpectedly, XMCD spectra show that the orbital component of the $5f$ magnetic moment increases significantly between 30 and 2 K; the antiparallel spin component increases as well, leaving the total moment practically constant. We suggest that this indicates a low-temperature breakdown of the complete Kondo-like screening of the local 5$f$ moment. Comment: Accepted for publication in Phys. Rev. Lett., prl.aps.org |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.119.157204 |
| URL الوصول: | http://arxiv.org/abs/1709.04810 |
| رقم الأكسشن: | edsarx.1709.04810 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.119.157204 |
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