Electronic structure of the BaTi2As2O parent compound of the titanium-based oxypnictide superconductor
H. C. Xu, M. Xu, R. Peng, Y. Zhang, Q. Q. Ge, F. Qin, M. Xia, J. J. Ying, X. H. Chen, X. L. Yu, L. J. Zou, M. Arita, K. Shimada, M. Taniguchi, D. H. Lu, B. P. Xie, D. L. Feng
DOI 10.1103/PhysRevB.89.155108 · Physical Review B
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Abstract
The electronic structure of BaTi2As2O, a parent compound of the newly discovered titanium-based oxypnictide superconductors, is studied by angle-resolved photoemission spectroscopy and first-principles calculation. The experimental electronic structure shows a multiorbital nature and three-dimensional character, which is consistent with the calculated results. An anomalous temperature-dependent spectral weight redistribution and broad line shape indicate the incoherent nature of the spectral function. At the density-wave-like transition temperature around 200 K, a partial gap opens at the Fermi patches. These findings suggest that BaTi2As2O is likely a charge density wave material in the strong-interaction regime.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba1-xNaxTi2Sb2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.5 | Pressure not reported | unknown |
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