Cu-induced surface disruption of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">La</mi></mrow><mrow><mn>1.85</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Sr</mi></mrow><mrow><mn>0.15</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">CuO</mi></mrow><mrow><mn>4</mn></mrow></msub></mrow></math>

D. M. Hill; Y. Gao; H. M. Meyer, III; T. J. Wagener; J. H. Weaver; D. W. Capone, II

doi:10.1103/PhysRevB.37.511

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Cu-induced surface disruption of ${La}_{1.85}$ ${Sr}_{0.15}$ ${CuO}_{4}$

D. M. Hill, Y. Gao, H. M. Meyer, III, T. J. Wagener, and J. H. Weaver

D. W. Capone, II

Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455

Materials Science Division, Building 223, Argonne National Laboratory, Argonne, Illinois 60439

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Phys. Rev. B 37, 511 – Published 1 January, 1988

DOI: https://doi.org/10.1103/PhysRevB.37.511

Abstract

Interface reactions for vapor-deposited Cu on ${La}_{1.85}$ ${Sr}_{0.15}$ ${CuO}_{4}$ were investigated with x-ray photoemission and inverse photoemission. Strong Cu-O reactions indicate oxygen removal and the $Cu {2 p}_{\frac{3}{2}}$ emission shows conversion of the superconductor ${Cu}^{2 +}$ configuration to ${Cu}^{1 +}$ within 40-50 Å of the surface. Valence-band results show a loss of the $Cu {3 d}_{x^{2} - y^{2}} - O {2 p}_{x, y}$ electronic states near the Fermi level, and we conclude that the surface layer is not superconducting. Changes in the occupied and empty electronic states of La at low Cu coverages provide additional evidence of Cu-induced reaction. A metallic overlayer begins to form at ∼2 Å nominal Cu coverage as these surface reactions become diffusion limited at room temperature.

References (12)

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[c1] J. G. Bednorz and K. A. Müller, Z. Phys. B 64, 189 (1986)

[c2] C. W. Chu, P. H. Hor, R. L. Meng, L. Gao, Z. J. Huang, and Y. Q. Wang, Phys. Rev. Lett. 58, 405 (1987)

[c3] R. J. Cava, A. Santoro, D. W. Johnson, Jr., and W. W. Rhodes, Phys. Rev. B 35, 6717 (1987) T. Seigrist, S. Sunshine, D. W. Murphy, R. J. Cava, and S. M. Zahurak, ibid. 35, 7137 (1987)

[c4] L. F. Mattheiss, Phys. Rev. Lett. 58, 1028 (1987) J. Yu, A. J. Freeman, and J. -H. Xu, ibid. 58, 1035 (1987) W. E. Pickett, H. Krakauer, D. A. Papaconstantopoulos, and L. Boyer, Phys. Rev. B 35, 7252 (1987) F. Herman, R. V. Kasowski, and W. Y. Hsu, ibid. 36, 6904 (1987)

[c5] R. B. van Dover, R. J. Cava, B. Batlogg, and E. A. Rietman, Phys. Rev. B 35, 5337 (1987)

[c6] D. M. Hill, H. M. Meyer III, J. H. Weaver, B. Flandermeyer, and D. W. Capone II, Phys. Rev. B 36, 3979 (1987) J. H. Weaver, Y. Gao, T. J. Wagener, B. Flandermeyer, and D. W. Capone II, ibid. 36, 3975 (1987) Y. Gao, T. J. Wagener, J. H. Weaver, B. Flandermeyer, and D. W. Capone II, Appl. Phys. Lett. 51, 7032 (1987) H. M. Meyer III, T. J. Wagener, D. M. Hill, Y. Gao, S. G. Anderson, S. D. Krahn, J. H. Weaver, B. Flandermeyer, and D. W. Capone II, ibid. 51, 1118 (1987)

[c7] S. A. Chambers, D. M. Hill, F. Xu, and J. H. Weaver, Phys. Rev. B 3, 634 (1987)

[c8] J. D. Jorgensen, H. B. Schuttler, D. G. Hinks, D. W. Capone II, K. Zhang, M. B. Brodsky, and D. J. Scalapino, Phys. Rev. Lett. 58, 1024 (1987)

[c9] Y. Gao, T. J. Wagener, J. H. Weaver, A. J. Arko, B. Flandermeyer, and D. W. Capone II, Phys. Rev. B 36, 3471 (1987)

[c10] G. van der Laan, C. Westra, C. Haas, and G. A. Sawatsky, Phys. Rev. B 23, 4369 (1981)

[c11] R. Kumar, M. H. Mintz, and J. W. Rabalais, Surf. Sci. 147, 37 (1984)

[c12] Zhangda Lin, F. Xu, and J. H. Weaver, Phys. Rev. B 36, 5777 (1987)

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Cu-induced surface disruption of ${La}_{1.85}$ ${Sr}_{0.15}$ ${CuO}_{4}$

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References (12)

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Cu-induced surface disruption of La1.85Sr0.15CuO4

Abstract

References (12)

Cu-induced surface disruption of ${La}_{1.85}$ ${Sr}_{0.15}$ ${CuO}_{4}$