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Non-RPA behavior of the valence plasmon in SrTi1− NbO3
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dc.contributor.author | Kengle, Caitlin S. | |
dc.contributor.author | Rubeck, Samantha I. | |
dc.contributor.author | Rak, Melinda | |
dc.contributor.author | Chen, Jin | |
dc.contributor.author | Hoveyda, Faren | |
dc.contributor.author | Bettler, Simon | |
dc.contributor.author | Husain, Ali | |
dc.contributor.author | Mitrano, Matteo | |
dc.contributor.author | Edelman, Alexander | |
dc.contributor.author | Littlewood, Peter | |
dc.contributor.author | Chiang, Tai Chang | |
dc.contributor.author | Mahmood, Fahad | |
dc.contributor.author | Abbamonte, Peter | |
dc.date.accessioned | 2024-07-22T16:30:11Z | |
dc.date.available | 2024-07-22T16:30:11Z | |
dc.date.issued | 2023-11-15 | |
dc.identifier | 300218805 | |
dc.identifier | c978cc5c-1142-4c7f-a73c-d0110645227f | |
dc.identifier | 85177613878 | |
dc.identifier.citation | Kengle , C S , Rubeck , S I , Rak , M , Chen , J , Hoveyda , F , Bettler , S , Husain , A , Mitrano , M , Edelman , A , Littlewood , P , Chiang , T C , Mahmood , F & Abbamonte , P 2023 , ' Non-RPA behavior of the valence plasmon in SrTi 1− Nb O 3 ' , Physical Review B - Condensed Matter and Materials Physics , vol. 108 , no. 20 , 205102 . https://doi.org/10.1103/PhysRevB.108.205102 | en |
dc.identifier.issn | 1098-0121 | |
dc.identifier.uri | https://hdl.handle.net/10023/30252 | |
dc.description | Funding: We thank Dirk van der Marel, Alexey Kuzmenko, and Simone Fratini for helpful discussions. This work was supported by the Center for Quantum Sensing and Quantum Materials, a DOE Energy Frontier Research Center, under Award DE-SC0021238. P.A. acknowledges support from the EPiQS program of the Gordon and Betty Moore Foundation, Grant No. GBMF9452. M.M. acknowledges support from the Alexander von Humboldt Foundation. S.B. acknowledges support through the Early Postdoc Mobility Fellowship from the Swiss National Science Foundation, Grant No. P2EZP2 191885. | en |
dc.description.abstract | Doped SrTi1-x NbxO3 is a dilute polaronic metal that exhibits superconductivity and a mid-infrared optical response suggesting parallels with copper oxides. A peculiar feature of SrTi1-x NbxO3 is that its plasma frequency, ωp, is highly temperature dependent, increasing by more than a factor of 2 when the system is cooled from 300 to 100 K [F. Gervais et al., Phys. Rev. B 47, 8187 (1993); D. M. Eagles et al., Phys. Rev. B 54, 22 (1996); C. Z. Bi et al., J. Phys.: Condens. Matter 18, 2553 (2006). There is still no generally accepted explanation for this dramatic shift. Here, we present momentum-resolved electron energy-loss spectroscopy measurements of SrTi1-x NbxO3 at nonzero momentum, q. We also calculate the collective excitations of SrTi1-x NbxO3 using the random phase approximation (RPA), to assess whether the behavior of the collective modes conforms to established explanations. We find that the plasmon energy and linewidth are momentum independent, in contrast to RPA predictions, and that its shift with temperature takes place everywhere in the Brillouin zone, from q=0 to the zone boundary, q=0.5 reciprocal lattice units. We also find that the phonon frequencies do not shift with q in the expected way, suggesting the screening properties of the material deviate significantly from RPA predictions. We conclude that a radically different starting point, perhaps based on lattice anharmonicity, may be needed to explain the collective charge excitations of SrTi1-x NbxO3. | |
dc.format.extent | 9 | |
dc.format.extent | 2480256 | |
dc.language.iso | eng | |
dc.relation.ispartof | Physical Review B - Condensed Matter and Materials Physics | en |
dc.subject | QC Physics | en |
dc.subject | Electronic, Optical and Magnetic Materials | en |
dc.subject | Condensed Matter Physics | en |
dc.subject | I-PW | en |
dc.subject.lcc | QC | en |
dc.title | Non-RPA behavior of the valence plasmon in SrTi1− NbO3 | en |
dc.type | Journal article | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.identifier.doi | https://doi.org/10.1103/PhysRevB.108.205102 | |
dc.description.status | Peer reviewed | en |
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