Lemmens, P. ; Gnezdilov, V. ; Shu, G. J. ; Alff, L. ; Lin, C. T. ; Keimer, B. ; Chou, F. C. (2013)
Enhanced low-energy fluctuations and increasing out-of-plane coherence in vacancy-ordered Na_{x}CoO_{2}.
In: Physical Review B, 88 (19)
doi: 10.1103/PhysRevB.88.195151
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We report Raman scattering experiments on the strongly correlated electron system NaxCoO2 with x = 0.71 and ordered Na vacancies. This phase exhibits unusual transport and thermodynamic properties. Furthermore, hydrated samples with the same Co valency are superconducting. Our Raman scattering data reveal pronounced low-energy fluctuations that diverge in intensity at low temperatures. There is a related decrease of the electronic scattering rate Γ from 50 to 3 cm−1. Simultaneous with the evolution of the scattering rate, phonon anomalies point to an increasing out-of-plane coherence of the lattice with decreasing temperature. These observations may indicate the condensation of spin polarons into an unusual, highly dynamic ground state.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Lemmens, P. ; Gnezdilov, V. ; Shu, G. J. ; Alff, L. ; Lin, C. T. ; Keimer, B. ; Chou, F. C. |
| Art des Eintrags: | Bibliographie |
| Titel: | Enhanced low-energy fluctuations and increasing out-of-plane coherence in vacancy-ordered Na_{x}CoO_{2} |
| Sprache: | Englisch |
| Publikationsjahr: | 27 November 2013 |
| Verlag: | American Physical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review B |
| Jahrgang/Volume einer Zeitschrift: | 88 |
| (Heft-)Nummer: | 19 |
| DOI: | 10.1103/PhysRevB.88.195151 |
| Kurzbeschreibung (Abstract): | We report Raman scattering experiments on the strongly correlated electron system NaxCoO2 with x = 0.71 and ordered Na vacancies. This phase exhibits unusual transport and thermodynamic properties. Furthermore, hydrated samples with the same Co valency are superconducting. Our Raman scattering data reveal pronounced low-energy fluctuations that diverge in intensity at low temperatures. There is a related decrease of the electronic scattering rate Γ from 50 to 3 cm−1. Simultaneous with the evolution of the scattering rate, phonon anomalies point to an increasing out-of-plane coherence of the lattice with decreasing temperature. These observations may indicate the condensation of spin polarons into an unusual, highly dynamic ground state. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Dünne Schichten 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 10 Jan 2014 11:17 |
| Letzte Änderung: | 10 Jan 2014 11:17 |
| PPN: | |
| Sponsoren: | This work was supported by Deutsche Forschungsgemeinschaft (DFG AL560/6, KE923/2, LE967/4). |
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