Fabrication and Characterization of Electrically Functional Lanthanum Hexaboride Thin Films on Ultrasmooth Sapphire Substrates

Abstract

The crystal growth of lanthanum hexaboride (LaB6) thin films was examined by applying the laser molecular beam epitaxy (laser MBE) process. C-axis (100) highly-oriented LaB6 thin films could be fabricated on ultrasmooth sapphire (α-Al2O3 single crystal) (0001) substrates with atomic steps of 0.2 nm in height and atomically flat terraces. The obtained film exhibited a smooth surface with root mean square roughness of 0.15 nm. The lattice parameter of the LaB6 thin film was close to the bulk value reported previously. In the case of deposition on commercial mirror-polished sapphire substrates, the grown film was amorphous. The resistivity of the prepared crystalline LaB6 thin films was as low as 2.2 × 10−4 Ω cm and almost constant in the temperature range of 10–300 K.

References

  1. 1.

    D. Mandrus, B. C. Sales, and R. Jin, Phys. Rev. B, 64, 012302 (2001).

    Article  Google Scholar 

  2. 2.

    M. Aono, R. Nishitani, C. Oshima, T. Tanaka, E. Bannai, and S. Kawai, J. Appl. Phys., 50, 4802 (1979).

    CAS  Article  Google Scholar 

  3. 3.

    M. Aono, C. Oshima, T. Tanaka, E. Bannai, and S. Kawai, J. Appl. Phys., 49, 2761 (1978).

    CAS  Article  Google Scholar 

  4. 4.

    C.-H. Chen, T. Aizawa, N. Iyi, A. Sato, and S. Otani, Journal of Alloys and Compounds, 366, L6–L8 (2004).

    CAS  Article  Google Scholar 

  5. 5.

    M. Aono, T. Tanaka, E. Bannai, C. Oshima, and S. Kawai, Phys. Rev. B, 16, 3489 (1977).

    CAS  Article  Google Scholar 

  6. 6.

    A. Hasegawa and A. Yanase, J. Phys. F: Metal Phys., 7, 1245 (1977).

    CAS  Article  Google Scholar 

  7. 7.

    T. Tanaka, T. Akahane, E. Bannai, S. Kawai, N. Tsuda, and Y. Ishizawa, J. Phys. C: Solid State Phys., 9, 1235 (1976).

    CAS  Article  Google Scholar 

  8. 8.

    H. Kawanowa, R. Souda, S. Otani, T. Ikeuchi, Y. Gotoh, P. Stracke, S. Krischok, and V. Kempter, Surf. Sci., 482–485, 250–253 (2001).

  9. 9.

    M. Zhang, L. Yuan, X. Wang, H. Fan, X. Wang, X. Wu, H. Wang, and Y. Qian, J. Solid State Chem., 181, 294–297 (2008).

    CAS  Article  Google Scholar 

  10. 10.

    R. J. Sobczak, and M. J. Sienko, J. Less-Com. Metals, 67, 167 (1979).

    CAS  Article  Google Scholar 

  11. 11.

    Z. Fisk, H. R. Ott, V. Barzykin, and L. P. Gor’kov, Physica B, 312–313, 808–810 (2002).

  12. 12.

    P. Vonlanthen et al., Physica B, 284–288, 1361–1362 (2000).

  13. 13.

    H. Zhang, Q. Zhang, J. Tang, and L.-C. Qin, J. Am. Chem. Soc., 127, 2862 (2005).

    CAS  Article  Google Scholar 

  14. 14.

    C. Mitterer, J. Solid State Chem., 133, 279–291 (1997).

    CAS  Article  Google Scholar 

  15. 15.

    T. Nakano, S. Baba, A. Kobayashi, A. Kinbara, T. Kajiwara, and K. Watanabe, J. Vac. Sci. Technol. A, 9, 547 (1991).

    CAS  Article  Google Scholar 

  16. 16.

    I. Terasaki, S. Uchida, S. Tajima, K. Uchinokura, and S. Tanaka, J. Phys. Soc. Jpn., 59, 1017 (1990).

    CAS  Article  Google Scholar 

  17. 17.

    V. Craciun and D. Craciun, Appl. Surf. Sci., 247, 384–389 (2005).

    CAS  Article  Google Scholar 

  18. 18.

    D. J. Late, K. S. Date, M. A. More, P. Misra, B. N. Singh, L. M. Kukreja, C. V. Dharmadhikari, and D. S. Joag, Nanotechnology, 19, 265605 (2008).

    Article  Google Scholar 

  19. 19.

    D. J. Late, M. A. More, P. Misra, B. N. Singh, L. M. Kukreja, and D. S. Joag, Ultramicroscopy, 107, 825–832 (2007).

    CAS  Article  Google Scholar 

  20. 20.

    J. Tashiro, A. Sasaki, S. Akiba, S. Satoh, T. Watanabe, H. Funakubo, and M. Yoshimoto, Thin Solid Films, 415, 272–275 (2002).

    CAS  Article  Google Scholar 

  21. 21.

    T. Maeda, M. Yoshimoto, T. Ohnishi, G. H. Lee, and H. Koinuma, J. Cryst. Growth, 177, 95–101 (1997).

    CAS  Article  Google Scholar 

  22. 22.

    A. Sasaki, W. Hara, A. Matsuda, N. Tateda, S. Otaka, S. Akiba, K. Saito, T. Yodo, and M. Yoshimoto, Appl. Phys. Lett., 86, 231911 (2005).

    Article  Google Scholar 

  23. 23.

    W. Hara, J. Liu, A. Sasaki, S. Otaka, N. Tateda, K. Saito, and M. Yoshimoto, Thin Solid Films, 516, 2889–2893 (2008).

    CAS  Article  Google Scholar 

  24. 24.

    A. Sasaki, J. Liu, W. Hara, S. Akiba, K. Saito, T. Yodo, and M. Yoshimoto, J. Mater. Res., 19, 2725 (2004).

    CAS  Article  Google Scholar 

  25. 25.

    M. Yoshimoto, T. Maeda, T. Ohnishi, O. Ishiyama, M. Shinohara, M. Kubo, R. Miura, A. Miyamoto, and H. Koinuma, Appl. Phys. Lett., 67, 2615 (1995).

    CAS  Article  Google Scholar 

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to Yushi Kato.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Kato, Y., Ono, Y., Akita, Y. et al. Fabrication and Characterization of Electrically Functional Lanthanum Hexaboride Thin Films on Ultrasmooth Sapphire Substrates. MRS Online Proceedings Library 1148, 1202 (2008). https://doi.org/10.1557/PROC-1148-PP12-02

Download citation