Local Structural Properties Around Cu Atoms in Checkerboard Phased Ca2−x Na x CuO2Cl2

  • K.-H. Kim
  • H.-G. Lee
  • S.-W. Han
Original Paper


We examined the local structural properties of checkerboard phased Ca2−x Na x CuO2Cl2 (T c =0, 15, 21, 27 K) using extended X-ray absorption fine structure (EXAFS) measurements at the Cu K edge. EXAFS revealed anomalous disorders existing in the bond lengths of Cu–Cu and Cu-Ca/Na pairs for all crystals below 50 K. A static disorder was observed even at room temperature. The disorders of the Cu–Cu in the a- and b-axes were independent of the T c value whereas these of the Cu–Ca/Na pairs located about 30 off from the Cu–O, ab-plane decreased, as T c increased.


NaCCOC Checkerboard phase Superconductivity EXAFS Structure 



The work at Chonbuk National University was supported by the Basic Science Research Program through the National Research Foundation of Korea government (NRF) grant funded by the Korean Ministry of Education, Science and Technology (MEST) (No. 2012R1A1A4A01007669). The XAFS data were collected at the 20BM beamline of APS, Argonne National Laboratory and at the 8C beamline of PLS.


  1. 1.
    Hanaguri, T., Lupien, C., Kohsaka, Y., Lee, D.-H., Azuma, M., Takano, M., Takagi, H., Davis, J.C.: Nature 430, 1001 (2004) ADSCrossRefGoogle Scholar
  2. 2.
    Kohsaka, Y., Iwaya, K., SaTow, S., Hanaguri, T., Azuma, M., Takano, M., Takagi, H.: Phys. Rev. Lett. 93, 97004 (2004) ADSCrossRefGoogle Scholar
  3. 3.
    Shen, K.M., Ronning, F., Lu, D.H., Baumberger, F., Ingle, N.J.C., Lee, W.S., Meevasana, W., Kohsaka, Y., Azuma, M., Takano, M., Takagi, H., Shen, Z.-X.: Science 307, 901 (2005) ADSCrossRefGoogle Scholar
  4. 4.
    Vershinin, M., Misra, S., Ono, S., Abe, Y., Ando, Y., Yazdani, A.: Science 303, 1995 (2004) ADSCrossRefGoogle Scholar
  5. 5.
    Hoffman, J.E., Hudson, E.W., Lang, K.M., Madhavan, V., Eisaki, H., Uchida, S., Davis, J.C.: Science 295, 466 (2002) ADSCrossRefGoogle Scholar
  6. 6.
    Franz, M.: Science 305, 1410 (2004) CrossRefGoogle Scholar
  7. 7.
    Stern, E.A.: Phys. Rev. B 10, 3027 (1974) ADSCrossRefGoogle Scholar
  8. 8.
    Rehr, J.J., Albers, R.C.: Phys. Rev. B 41, 8139 (1999) ADSCrossRefGoogle Scholar
  9. 9.
    Kim, K.-H., Kim, H.-J., Kim, J.-D., Lee, H.-G., Lee, S.-I.: Phys. Rev. B 72, 224510 (2005) ADSCrossRefGoogle Scholar
  10. 10.
    Kim, K.-H., Lee, H.-G., Lee, S.-I., Han, S.-W.: J. Supercond. Nov. Magn. 23, 391 (2010) CrossRefGoogle Scholar
  11. 11.
    Stern, E.A., Newville, M., Ravel, B., Yacoby, Y., Haskel, D.: Physica B 208–209, 117 (1995) CrossRefGoogle Scholar
  12. 12.
    Han, S.-W., Stern, E.A., Hankel, D., Moodenbaugh, A.R.: Phys. Rev. B 66, 94101 (2002) ADSCrossRefGoogle Scholar
  13. 13.
    Ankudinov, A.L., Ravel, B., Rehr, J.J., Conradson, S.D.: Phys. Rev. B 58, 7565 (1998) ADSCrossRefGoogle Scholar
  14. 14.
    Jeong, E.-S., Park, J., Park, J.-G., Adipranoto, D.S., Kamiyama, T., Han, S.-W.: J. Phys. Condens. Matter 23, 175402 (2011) ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Department of PhysicsPohang University of Science and TechnologyPohangRepublic of Korea
  2. 2.Institute of Fusion Science and the Department of Physics EducationChonbuk National UniversityJeonjuRepublic of Korea

Personalised recommendations