Abstract
The electronic structure of Na2Ti2Sb2O single crystal is studied by photon energy and polarization dependent angle-resolved photoemission spectroscopy (ARPES). The obtained band structure and Fermi surface agree well with the band structure calculation of Na2Ti2Sb2O in the non-magnetic state, which indicates that there is no magnetic order in Na2Ti2Sb2O and the electronic correlation is weak. Polarization dependent ARPES results suggest the multi-band and multi-orbital nature of Na2Ti2Sb2O. Photon energy dependent ARPES results suggest that the electronic structure of Na2Ti2Sb2O is rather two-dimensional. Moreover, we find a density wave energy gap forms below the transition temperature and reaches 65 meV at 7 K, indicating that Na2Ti2Sb2O is likely a weakly correlated CDW material in the strong electron-phonon interaction regime.
Highlights
The electronic structure of Na2Ti2Sb2O single crystal is studied by photon energy and polarization dependent angle-resolved photoemission spectroscopy (ARPES)
We investigate the electronic structure of Na2Ti2Sb2O with angle-resolved photoemission spectroscopy (ARPES)
Temperature dependent ARPES results reveal that a density wave energy gap forms below the transition temperature and reaches 65 meV at 7 K, indicating that Na2Ti2Sb2O is likely a weakly correlated charge-density wave (CDW) material in the strong electron-phonon interaction regime
Summary
The electronic structure of Na2Ti2Sb2O single crystal is studied by photon energy and polarization dependent angle-resolved photoemission spectroscopy (ARPES). The discovery of basic superconducting layers, such as the CuO2 plane[1] in cuprates and Fe2An2 (An 5 P, As, S, Se, Te) layers[2] in iron based superconductors, have opened new fields in physics and chemistry of layered superconductors Another class of layered compounds built from alternatively stacking of special conducting octahedral layers Ti2Pn2O (Pn5Sb, As) and certain charge reservoir layers [e.g., Na2, Ba, (SrF)[2], (SmO)2] have attracted much attention[3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]. Temperature dependent ARPES results reveal that a density wave energy gap forms below the transition temperature and reaches 65 meV at 7 K, indicating that Na2Ti2Sb2O is likely a weakly correlated CDW material in the strong electron-phonon interaction regime
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