Advertisement

The European Physical Journal B

, Volume 75, Issue 4, pp 461–467 | Cite as

Raman light scattering study and microstructural analysis of epitaxial films of the electron-doped superconductor La2 -x Ce x CuO4

  • M. Rahlenbeck
  • M. Wagenknecht
  • A. Tsukada
  • D. Koelle
  • R. Kleiner
  • B. Keimer
  • C. Ulrich
Solid State and Materials

Abstract

We present a detailed temperature-dependent Raman light scattering study of optical phonons in molecular-beam-epitaxy-grown films of the electron-doped superconductor La2 -x Ce x CuO4 close to optimal doping (x ~ 0.08, T c = 29 K and x ~ 0.1, T c = 27 K). The main focus of this work is a detailed characterization and microstructural analysis of the films. Based on micro-Raman spectroscopy in combination with X-ray diffraction, energy-dispersive X-ray analysis, and scanning electron microscopy, some of the observed phonon modes can be attributed to micron-sized inclusions of Cu2O. In the slightly underdoped film (x ~ 0.08), both the Cu2O modes and others that can be assigned to the La2 -x Ce x CuO4 matrix show pronounced softening and narrowing upon cooling below T ~ T c . Based on control measurements on commercial Cu2O powders and on a comparison to prior Raman scattering studies of other high-temperature superconductors, we speculate that proximity effects at La2 -x Ce x CuO4/Cu2O interfaces may be responsible for these anomalies. Experiments on the slightly overdoped La2 -x Ce x CuO4 film (x ~ 0.1) did not reveal comparable phonon anomalies.

Keywords

Phonon Anomaly Electronic Raman Scattering Prior Transport Anharmonic Decay Observe Phonon Mode 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    P.K. Mang, S. Larochelle, A. Mehta, O.P. Vajk, A.S. Erickson, L. Lu, W.J.L. Buyers, A.F. Marshall, K. Prokes, M. Greven, Phys. Rev. B 70, 094507 (2004) CrossRefADSGoogle Scholar
  2. 2.
    G. Roberge, S. Charpentier, S. Godin-Proulx, P. Rauwel, K.D. Truong, P. Fournier, J. Cryst. Growth 311, 1340 (2009) CrossRefADSGoogle Scholar
  3. 3.
    For a review, see N.P. Armitage, P. Fournier, R.L. Greene, preprint arXiv:0906.2931 Google Scholar
  4. 4.
    M. Naito, M. Hepp, Jpn J. Appl. Phys. 39, L485 (2000) CrossRefADSGoogle Scholar
  5. 5.
    A. Sawa, M. Kawasaki, H. Takagi, Y. Tokura, Phys. Rev. B 66, 014531 (2002) CrossRefADSGoogle Scholar
  6. 6.
    Y. Krockenberger, J. Kurian, A. Winkler, A. Tsukada, M. Naito, L. Alff, Phys. Rev. B 77, 060505(R) (2008) CrossRefADSGoogle Scholar
  7. 7.
    M. Naito, A. Tsukada, T. Greibe, H. Sato, Proc. SPIE 4811, 140 (2002) CrossRefADSGoogle Scholar
  8. 8.
    A. Tsukada, H. Yamamoto, M. Naito, Phys. Rev. B 74, 174515 (2006) CrossRefADSGoogle Scholar
  9. 9.
    A. Tsukada, Y. Krockenberger, M. Noda, H. Yamamoto, D. Manske, L. Alff, M. Naito, Solid State Commun. 133, 427 (2005) CrossRefADSGoogle Scholar
  10. 10.
    For a review, see T.P. Devereaux, R. Hackl, Rev. Mod. Phys. 79, 175 (2007) CrossRefADSGoogle Scholar
  11. 11.
    C. Thomsen, in Light Scattering in Solids VI, Topics Appl. Phys., edited by M. Cardona, G. Güntherodt (Springer, 1991), Vol. 68, p. 285 Google Scholar
  12. 12.
    M. Bakr, A.P. Schnyder, L. Klam, D. Manske, C.T. Lin, B. Keimer, M. Cardona, C. Ulrich, Phys. Rev. B 80, 064505 (2009) CrossRefADSGoogle Scholar
  13. 13.
    G. Blumberg, A. Koitzsch, A. Gozar, B.S. Dennis, C.A. Kendziora, P. Fournier, R.L. Green, Phys. Rev. Lett. 88, 107002 (2002) CrossRefADSGoogle Scholar
  14. 14.
    M.M. Qazilbash, A. Koitzsch, B.S. Dennis, A. Gozar, H. Balci, C.A. Kendziora, R.L. Greene, G. Blumberg, Phys. Rev. B 72, 214510 (2005) CrossRefADSGoogle Scholar
  15. 15.
    M. Wagenknecht, D. Koelle, R. Kleiner, S. Graser, N. Schopohl, B. Chesca, A. Tsukada, S.T.B. Goennenwein, R. Gross, Phys. Rev. Lett. 100, 227001 (2008) CrossRefADSGoogle Scholar
  16. 16.
    M. Wagenknecht, M. Rahlenbeck, D. Koelle, R. Kleiner, A. Tsukada, S.T.B. Goennenwein, R. Gross, submitted to Phys. Rev. B Google Scholar
  17. 17.
    M. Rahlenbeck, unpublished data Google Scholar
  18. 18.
    M. Wagenknecht, Korngrenz-Tunnelspektroskopie am elektronendotierten Kupratsupraleiter La2-xCexCuO4, Ph.D. thesis, Tübingen University, 2008 Google Scholar
  19. 19.
    T. Greibe, MBE growth of superconducting thin films, Technical report (NTT Basic Research Laboratories, 2001) Google Scholar
  20. 20.
    V.G. Hadjiev, I.Z. Kostadinov, L. Bozukov, E. Dinolova, D.M. Mateev, Solid State Commun. 71, 1093 (1989) CrossRefADSGoogle Scholar
  21. 21.
    S. Sugai, T. Kobayashi, J. Akimitsu, Phys. Rev. B 40, 2686 (1989) CrossRefADSGoogle Scholar
  22. 22.
    E.T. Heyen, R. Liu, M. Cardona, S. Piñol, R.J. Melville, D. McK. Paul, E. Morán, M.A. Alario-Franco, Phys. Rev. B 43, 2857 (1991) CrossRefADSGoogle Scholar
  23. 23.
    Y. Petroff, P.Y. Yu, Y.R. Shen, Phys. Rev. B 12, 2488 (1975) CrossRefADSGoogle Scholar
  24. 24.
    Y. Petroff, P.Y. Yu, Y.R. Shen, Phys. Rev. Lett. 29, 1558 (1972) CrossRefADSGoogle Scholar
  25. 25.
    K. Huang, Z. Phys. 171, 213 (1963) CrossRefADSGoogle Scholar
  26. 26.
    Y. Petroff, J. Phys. Colloq. France C3 35, 277 (1974) Google Scholar
  27. 27.
    P.Y. Yu, Y.R. Shen, Y. Petroff, Solid State Commun. 12, 973 (1973) CrossRefADSGoogle Scholar
  28. 28.
    J. Menéndez, M. Cardona, Phys. Rev. B 29, 2051 (1984) CrossRefADSGoogle Scholar
  29. 29.
    V.G. Hadjiev, X. Zhou, T. Strohm, M. Cardona, Phys. Rev. B 58, 1043 (1998) CrossRefADSGoogle Scholar
  30. 30.
    H.L. Schlafer, G. Gliemann, Basic principles of Ligand Field Theory (Wiley, New York, 1969), p. 120 Google Scholar
  31. 31.
    C. Chen, L. He, L. Lai, H. Zhang, J. Lu, L. Guo, Y. Li, J. Phys.: Condens. Matter 21, 145601 (2009) CrossRefADSGoogle Scholar
  32. 32.
    A. Werner, H.D. Hochheimer, Phys. Rev. B 25, 5929 (1982) CrossRefADSGoogle Scholar
  33. 33.
    R. Zeyher, G. Zwicknagl, Z. Phys. B, Condens. Matter 78, 175 (1990) CrossRefGoogle Scholar
  34. 34.
    T.P. Devereaux, Phys. Rev. B 50, 10287 (1994) CrossRefADSGoogle Scholar
  35. 35.
    N.P. Armitage, D.H. Lu, C. Kim, A. Damascelli, K.M. Shen, F. Ronning, D.L. Feng, P. Bogdanov, Z.-X. Shen, Phys. Rev. Lett. 87, 147003 (2001) CrossRefADSGoogle Scholar
  36. 36.
    H. Matsui, T. Takahashi, T. Sato, K. Terashima, H. Ding, T. Uefuji, K. Yamada, Phys. Rev. B 75, 224514 (2007) CrossRefADSGoogle Scholar
  37. 37.
    Y. Onose, Y. Taguchi, K. Ishizaka, Y. Tokura, Phys. Rev. Lett. 87, 217001 (2001) CrossRefADSGoogle Scholar
  38. 38.
    A. Zimmers, J.M. Tomczak, R.P.S.M. Lobo, N. Bontemps, C.P. Hill, M.C. Barr, Y. Dagan, R.L. Greene, A.J. Millis, C.C. Homes, Europhys. Lett. 70, 225 (2005) CrossRefADSGoogle Scholar
  39. 39.
    Y. Dagan, M.M. Qazilbash, R.L. Greene, Phys. Rev. Lett. 94, 187003 (2005) CrossRefADSGoogle Scholar

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • M. Rahlenbeck
    • 1
  • M. Wagenknecht
    • 2
    • 3
  • A. Tsukada
    • 3
  • D. Koelle
    • 2
  • R. Kleiner
    • 2
  • B. Keimer
    • 1
  • C. Ulrich
    • 1
    • 4
    • 5
  1. 1.Max-Planck-Institut für FestkörperforschungStuttgartGermany
  2. 2.Physikalisches Institut - Experimentalphysik II, Universität TübingenTübingenGermany
  3. 3.NTT Basic Research LaboratoriesKanagawaJapan
  4. 4.University of New South Wales, School of PhysicsNew South WalesAustralia
  5. 5.The Bragg InstituteLucas HeightsAustralia

Personalised recommendations