ISIS Neutron and Muon Source Data Journal

Phonon dispersions in CDW material Na2Ti2Sb2O

Abstract: Na2Ti2Sb2O has a CDW transition around 120 K . It has a tetragonal structure with alternate layers of Ti2Sb2O2- and Na+ double layer. Interestingly, the Ba1-xNaxTi2Sb2O system exhibits superconductivity with a maximum Tc of 5.5 K. It is demonstrated that the Fermi surfaces around Gama and X can only overlap with each other with several points,clearly ruling out the Fermi surface nesting as the main source of the CDW transition.On the other hand, a very strong renormalization of the electron mass is found at the CDW wave vector (0.5,0.5), suggesting the presence of very strong electron phonon coupling in this system. In 2H-NbSe2, it has been shown that acoustic phonons soften to zero frequency and become overdamped over an extended region around the CDW wave vector. Similarly, we propose to study the phonon dispersions in Na2Ti2Sb2O and the origin of the CDW phase in this material.

Principal Investigator: Dr Shiliang Li
Experimenter: Miss Huican Mao
Experimenter: Dr Hui-Qian Luo
Experimenter: Miss Yanhong Gu
Local Contact: Dr David Voneshen
Experimenter: Mr Ding Hu

DOI: 10.5286/ISIS.E.RB1520051

ISIS Experiment Number: RB1520051

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Dr Shiliang Li et al; (2015): Phonon dispersions in CDW material Na2Ti2Sb2O, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1520051

Data is released under the CC-BY-4.0 license.