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Journal Article

Out-of-plane orbital characters of intrinsic and doped holes in La2-xSrxCuO4

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Chen, C. T., Tjeng, L. H., Kwo, J., Kao, H. L., Rudolf, P., Sette, F., et al. (1992). Out-of-plane orbital characters of intrinsic and doped holes in La2-xSrxCuO4. Physical Review Letters, 68(16), 2543-2546. doi:10.1103/PhysRevLett.68.2543.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-1F1A-8
Bulk-sensitive, polarization-dependent O K- and Cu L-edge absorption spectra of single-domain La2-xSrxCuO4 with CuO2 planes tilted off the sample surface were measured. A novel experimental configuration was utilized to achieve complete polarization geometry and eliminate optical path variations. Contrary to previous measurements, our data show for both intrinsic and doped holes a significant amount of 0 2p(z) character, likely associated with apical O, but a very weak Cu 3d3z2-r2 character. These results impose strong constraints on superconductivity models invoking out-of-plane orbitals, and suggest that the apical O 2p(z) orbital may play an important role in high-T(c) phenomena.