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| 001 | 862499 | ||
| 005 | 20210130001419.0 | ||
| 024 | 7 | _ | |a 10.1073/pnas.1819664116 |2 doi |
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| 100 | 1 | _ | |a Čermák, Petr |0 P:(DE-Juel1)159141 |b 0 |u fzj |
| 245 | _ | _ | |a Magnetoelastic hybrid excitations in CeAuAl 3 |
| 260 | _ | _ | |a Washington, DC |c 2019 |b National Acad. of Sciences |
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| 520 | _ | _ | |a Nearly a century of research has established the Born–Oppenheimer approximation as a cornerstone of condensed-matter systems, stating that the motion of the atomic nuclei and electrons may be treated separately. Interactions beyond the Born–Oppenheimer approximation are at the heart of magneto-elastic functionalities and instabilities. We report comprehensive neutron spectroscopy and ab initio phonon calculations of the coupling between phonons, CEF-split localized 4f electron states, and conduction electrons in the paramagnetic regime of CeAuAl3, an archetypal Kondo lattice compound. We identify two distinct magneto-elastic hybrid excitations that form even though all coupling constants are small. First, we find a CEF–phonon bound state reminiscent of the vibronic bound state (VBS) observed in other materials. However, in contrast to an abundance of optical phonons, so far believed to be essential for a VBS, the VBS in CeAuAl3 arises from a comparatively low density of states of acoustic phonons. Second, we find a pronounced anticrossing of the CEF excitations with acoustic phonons at zero magnetic field not observed before. Remarkably, both magneto-elastic excitations are well developed despite considerable damping of the CEFs that arises dominantly by the conduction electrons. Taking together the weak coupling with the simultaneous existence of a distinct VBS and anticrossing in the same material in the presence of damping suggests strongly that similarly well-developed magneto-elastic hybrid excitations must be abundant in a wide range of materials. In turn, our study of the excitation spectra of CeAuAl3 identifies a tractable point of reference in the search for magneto-elastic functionalities and instabilities. |
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| 700 | 1 | _ | |a Schneidewind, Astrid |0 P:(DE-Juel1)156579 |b 1 |
| 700 | 1 | _ | |a Liu, Benqiong |0 P:(DE-Juel1)171229 |b 2 |
| 700 | 1 | _ | |a Koza, Michael Marek |0 P:(DE-HGF)0 |b 3 |
| 700 | 1 | _ | |a Franz, Christian |0 P:(DE-HGF)0 |b 4 |
| 700 | 1 | _ | |a Schönmann, Rudolf |0 P:(DE-HGF)0 |b 5 |
| 700 | 1 | _ | |a Sobolev, Oleg |0 P:(DE-HGF)0 |b 6 |
| 700 | 1 | _ | |a Pfleiderer, Christian |0 P:(DE-HGF)0 |b 7 |e Corresponding author |
| 773 | _ | _ | |a 10.1073/pnas.1819664116 |g Vol. 116, no. 14, p. 6695 - 6700 |0 PERI:(DE-600)1461794-8 |n 14 |p 6695 - 6700 |t Proceedings of the National Academy of Sciences of the United States of America |v 116 |y 2019 |x 1091-6490 |
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