Abstract
X-ray induced photoelectron spectroscopy, bremsstrahlung-isochromat spectroscopy, and electron energy-loss spectroscopy were used to investigate the electronic structure of the high-temperature superconductor La2−x Sr x CuO4. In general, good agreement was obtained with band structure calculations of the tetragonal phase of La2CuO4. Near the Fermi energyE F the systems shows forx=0 a smeared out gap or a region of very low density of states ∼2eV wide. Upon replacement of La by Sr, the gap is filled with defect states, the intensity of which is proportional tox. The experimental data are not consistent with the closing of a Peierls gap alone.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Bednorz, J.G., Müller, K.A.: Z. Phys. B-Condensed Matter64, 189 (1986)
Bednorz, J.G., Takashige, M., Müller, K.A.: Europhys. Lett.3, 379 (1987)
Uchida, S., Takagi, H., Kitazawa, K., Tanaka, S.: Jpn. J. Appl. Phys. Lett. (to be published)
Takagi, H., Uchida, S., Kitazawa, K., Tanaka, S.: Jpn. J. Appl. Phys. Lett. (to be published)
Chu, C.W., Hor, P.H., Meng, R.L., Gao, L., Huang, Z.J., Wang, Y.Q.: Phys. Rev. Lett.58, 405 (1987)
Cava, R.J., van Dover, R.B., Batlogg, B., Rietman, E.A.: Phys. Rev. Lett.58, 408 (1987)
Mattheiss, L.F.: Phys. Rev. Lett.58, 1028 (1987)
Yu, J., Freeman, A.J., and Xu, J.-H.: Phys. Rev. Lett.58, 1035 (1987)
Note that same authors write the formula of this material La2−x (Ba, Sr) x CuO4−y wherey emphasizes that the material probably contains an (at present unknown) quantity of oxygen vacancy sites. For simplicity we usually omity in the following text
Weber, W: Phys. Rev. Lett (in press)
Seah, M.P., and Dench, W.: Surf. Interface Anal.1, 2 (1979)
Fuggle, J.C., Watson, L.M., Fabian, D.J., Affrossman, S.: Surf. Sci.49, 61 (1975)
Wandelt, K.: Surf. Sci. Rep.2, 1 (1982)
Fink, J.: Z. Phys. B-Condensed Matter61, 463 (1985)
Lang, J.K., Baer, Y., Cox, P.A.: J. Phys. F: Metal Phys.11, 121 (1981)
Hagstrom, S., Nordling, C., Siegbahn, K.: Z. Phys.178, 439 (1964)
Kotani, A., Toyozawa, J.: J. Phys. Soc. Jpn.35, 1073, 1082 (1973)
van der Laan, G., Westra, C., Haas, C., Sawatzky, G.H.: Phys. Rev. B23, 4369 (1981)
Fuggle, J.C., Hillebrecht, F.U., Zołnierek, Z., Lässer, R., Freiburg, Ch., Gunnarsson, O., Schönhammer, K.: Phys. Rev. B27, 7330 (1983)
van der Laan, G., Zaanen, J., Sawatzky, G.A., Karnatak, R., Esteva, J.-M.: Phys. Rev. B33, 4253 (1986)
In preliminary studies by X-ray absorption spectroscopy (XAS) in photoyield mode we observed a stronger core exciton peak at the Cu 3d 5/2 edge of La2CuO4. We at present attribute this difference to the greater surface sensitivity of XAS in photoyield mode
Goedkoop, J.B., van der Laan, G., Fuggle, J.C.: Unpublished results
Grunes, L.A., Leapman, R.D., Wilker, C.N., Hoffmann, R., Kunz, A.B.: Phys. Rev. B25, 7157 (1982)
Iossell, J.A.: Chem. Phys.15, 303 (1976)
Pflüger, J., Fink, J., Crecelius, G., Bohnen, K.-P., Winter, H.: Solid State Commun.44, 489 (1982)
Jorgensen, J.D., Schüttler, H.-B., Hinks, D.G., Capone II D.W., Zhang, K., Brodsky, M.B., Scalapino, D.J.: Phys. Rev. Lett.58, 1024 (1987)
Prelevšek, P., Rice, T.M., Zhang, F.C.: Preprint
Schlapbach, L.: Solid State Commun.38, 117 (1981)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Nücker, N., Fink, J., Renker, B. et al. Experimental electronic structure studies of La2−x Sr x CuO4 . Z. Physik B - Condensed Matter 67, 9–14 (1987). https://doi.org/10.1007/BF01307300
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01307300