@article{chen_out--plane_1992,
	title = {Out-of-plane orbital characters of intrinsic and doped holes in {La}2−{xSrxCuO}4},
	volume = {68},
	issn = {0031-9007},
	url = {http://zernike.eldoc.ub.rug.nl/FILES/root/1992/PhysRevLettChen/1992PhysRevLettChen.pdf},
	doi = {10.1103/physrevlett.68.2543},
	abstract = {Bulk-sensitive, polarization-dependent oxygen K - and copper L -edge absorption spectra of single-domain La 2- x Sr x CuO 4 with CuO 2 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 O 2 p z character, likely associated with apical O , but a very weak Cu3 d 3 z 2 - r 2 character. The quantitative results impose strong contraints on superconductivity models invoking out-of-plane orbitals, and suggest that the apical O 2 p z orbital may play an important role in high- T c phenomena.},
	number = {16},
	journal = {Physical Review Letters},
	author = {Chen, C. T. and Tjeng, L. H. and Kwo, J. and Kao, H. L. and Rudolf, P. and Sette, F. and Fleming, R. M.},
	month = apr,
	year = {1992},
	pages = {2543--2546}
}

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