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), pp. 195151-5 (pp). American Physical Society, ISSN 1098-0121,
[Article]
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.
| Item Type: | Article |
|---|---|
| Erschienen: | 2013 |
| Creators: | Lemmens, P. ; Gnezdilov, V. ; Shu, G. J. ; Alff, L. ; Lin, C. T. ; Keimer, B. ; Chou, F. C. |
| Title: | Enhanced low-energy fluctuations and increasing out-of-plane coherence in vacancy-ordered Na_{x}CoO_{2} |
| Language: | English |
| 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. |
| Journal or Publication Title: | Physical Review B |
| Journal volume: | 88 |
| Number: | 19 |
| Publisher: | American Physical Society |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences |
| Date Deposited: | 10 Jan 2014 11:17 |
| Official URL: | http://dx.doi.org/10.1103/PhysRevB.88.195151 |
| Identification Number: | doi:10.1103/PhysRevB.88.195151 |
| Funders: | This work was supported by Deutsche Forschungsgemeinschaft (DFG AL560/6, KE923/2, LE967/4). |
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