Skip to main content

Temperature-Dependent As K-Edge EXAFS Studies of LaFe 1−x Co x AsO (x = 0.0 and 0.11) Single Crystals


We report the experimental results of temperature-dependent polarized As K-edge extended X-ray absorption fine structure (EXAFS) of LaFe1−x Co x AsO (x = 0.0 and 0.11) single crystals. By aligning the Fe–As bond direction in the direction of the X-ray beam polarization, we have been able to identify an anomaly in the Fe–As bond correlations at the tetragonal to orthorhombic transition at 150 K, while previous investigations with standard unpolarized EXAFS of undoped LaFeAsO powder samples were not able to detect any such anomaly. Using our approach, we have been able to identify in the superconducting doped sample, LaFe0.89Co0.11AsO, a broad anomaly around 60 K. The low-temperature anomaly has good correlations with the temperature dependence of several properties like resistivity, magnetic susceptibility and linear thermal expansion, indicating the emergence of the dynamical oscillations of the Fe–As pairs.

This is a preview of subscription content, access via your institution.

Fig. 1
Fig. 2
Fig. 3


  1. 1.

    Kamihara, Y., Watanabe, T., Hirano, M., Hosono, H.: J. Am. Chem. Soc. 130, 3296 (2008). doi:10.1021/ja800073m

    Article  Google Scholar 

  2. 2.

    Fratini, M., Caivano, R., Puri, A., et al.: Supercond. Sci. Technol. 21, 092002+ (2008). doi:10.1088/0953-2048/21/9/092002

    ADS  Article  Google Scholar 

  3. 3.

    Karpinski, J., et al.: Phys. C 469, 370 (2009)

    ADS  Article  Google Scholar 

  4. 4.

    Yan, J.Q., et al.: Appl. Phys. Lett. 95, 222504 (2009). doi:10.1063/1.3268435

    ADS  Article  Google Scholar 

  5. 5.

    Chen, Z.G., Yuan, R.H., Dong, T., Wang, N.L.: Phys. Rev. B 81, 100502 (2010). doi:10.1103/PhysRevB.81.100502

    ADS  Article  Google Scholar 

  6. 6.

    Dong, T., Chen, Z.G., Yuan, R.H., Hu, B.F., Cheng, B., Wang, N.L.: Phys. Rev. B 82, 054522 (2010). doi:10.1103/PhysRevB.82.054522

    ADS  Article  Google Scholar 

  7. 7.

    Jesche, A., Krellner, C., de Souza, M., Lang, M., Geibel, C.: Phys. Rev. B 81, 134525 (2010). doi:10.1103/PhysRevB.81.134525

    ADS  Article  Google Scholar 

  8. 8.

    Liu, H., Chen, G.F., Zhang, W., et al.: Phys. Rev. Lett. 105, 027001 (2010). doi:10.1103/PhysRevLett.105.027001

    ADS  Article  Google Scholar 

  9. 9.

    Ricci, A., Poccia, N., Joseph, B., et al.: Phys. Rev. B 82, 144507 (2010). doi:10.1103/PhysRevB.82.144507

    ADS  Article  Google Scholar 

  10. 10.

    Lumsden, M.D., Christianson, A.D.: J. Phys. Condens. Matter 22, 203203 (2010). doi:10.1088/0953-8984/22/20/203203

    ADS  Article  Google Scholar 

  11. 11.

    Yildirim, T.: Phys. Rev. Lett. 101, 057010 (2008). doi:10.1103/PhysRevLett.101.057010

    ADS  Article  Google Scholar 

  12. 12.

    Yin, Z.P., Lebègue, S., Han, M.J., Neal, B.P., Savrasov, S.Y., Pickett, W.E.: Phys. Rev. Lett. 101, 047001 (2008). doi:10.1103/PhysRevLett.101.047001

    ADS  Article  Google Scholar 

  13. 13.

    Wu, J., Phillips, P., Neto, A.H.C.: Phys. Rev. Lett. 101, 126401 (2008). doi:10.1103/PhysRevLett.101.126401

  14. 14.

    Tian, W., et al.: Phys. Rev. B 82, 060514 (2010). doi:10.1103/PhysRevB.82.060514

    ADS  Article  Google Scholar 

  15. 15.

    Qiu, Y., Bao, W., Huang, Q., et al.: Phys. Rev. Lett. 101, 257002 (2008). doi:10.1103/PhysRevLett.101.257002

    ADS  Article  Google Scholar 

  16. 16.

    de la Cruz, C., Huang, Q., Lynn, J.W., et al.: Nature 453, 899 (2008). doi:10.1038/nature07057

  17. 17.

    Zhao, J., et al.: Nat. Mater. 7, 953 (2008). doi:10.1038/nmat2315

    ADS  Article  Google Scholar 

  18. 18.

    Lanzara, A., Saini, N.L., Brunelli, M., Valletta, A., Bianconi, A.: J. Supercond. Nov. Magn. 10, 319 (1997). doi:10.1007/bf02765711

    ADS  Article  Google Scholar 

  19. 19.

    Saini, N.L., et al.: Phys. Rev. B 55, 12759 (1997). doi:10.1103/PhysRevB.55.12759

    ADS  Article  Google Scholar 

  20. 20.

    Toby, B.H., Egami, T., Jorgensen, J.D., Subramanian, M.A.: Phys. Rev. Lett. 64, 2414 (1990). doi:10.1103/PhysRevLett.64.2414

    ADS  Article  Google Scholar 

  21. 21.

    Božin, E. S., Kwei, G.H., Takagi, H., Billinge, S.J.L.: Phys. Rev. Lett. 84, 5856 (2000). doi:10.1103/PhysRevLett.84.5856

    ADS  Article  Google Scholar 

  22. 22.

    Zhang, C.J., Oyanagi, H., Sun, Z.H., Kamihara, Y., Hosono, H.: Phys. Rev. B 78, 214513 (2008). doi:10.1103/PhysRevB.78.214513

    ADS  Article  Google Scholar 

  23. 23.

    Iadecola, A., Agrestini, S., Filippi, M, Simonelli, L., Fratini, M., Joseph, B., Mahajan, D., Saini, N.L.: EPL (Europhysics Letters) 87, 26005 (2009). 0910.2329. doi:10.1209/0295-5075/87/26005

    ADS  Article  Google Scholar 

  24. 24.

    Zhang, C.J., Oyanagi, H., Sun, Z.H., Kamihara, Y., Hosono, H.: Phys. Rev. B 81, 094516 (2010). doi:10.1103/PhysRevB.81.094516

    ADS  Article  Google Scholar 

  25. 25.

    Joseph, B., Iadecola, A., Puri, A., Simonelli, L., Mizuguchi, Y., Takano, Y., Saini, N. L.: Phys. Rev. B 82, 020502 (2010). doi:10.1103/PhysRevB.82.020502

    ADS  Article  Google Scholar 

  26. 26.

    Tyson, T. A., et al.: J. Appl. Phys 108, 123715 (2010). doi:10.1063/1.3525999

    ADS  Article  Google Scholar 

  27. 27.

    Joseph, B., Iadecola, A., Malavasi, L., Saini, N.L.: J. Phys. Condens. Matter 23, 112202 (2011). doi:10.1088/0953-8984/23/26/265701

    ADS  Article  Google Scholar 

  28. 28.

    Joseph, B., Iadecola, A., Simonelli, L., et al.: Supercond. Sci. Technol 26, 065005 (2013). doi:10.1088/0953-2048/26/6/065005

    ADS  Article  Google Scholar 

  29. 29.

    Hascisalihoglu, M.Y., Paris, E., Joseph, B., et al.: Phys. Chem. Chem. Phys. 18, 9029 (2016). doi:10.1039/C5CP07985C

    Article  Google Scholar 

  30. 30.

    Louca, D., Horigani, K., Llobet, A., Arita, R., Ji, S., Katayama, N., Konbu, S., Nakamura, K., Koo, T. Y., Tong, P., et al.: Phys. Rev. B 81, 134524 (2010). doi:10.1103/PhysRevB.81.134524

    ADS  Article  Google Scholar 

  31. 31.

    Malavasi, L., Artioli, G. A., Kim, H., et al.: J. Phys. Condens. Matter 23, 272201 (2011). doi:10.1088/0953-8984/23/27/272201

    ADS  Article  Google Scholar 

  32. 32.

    Joseph, B., Zinth, V., Brunelli, M., Maroni, B., Johrendt, D., Malavasi, L.: J. Phys. Condens. Matter 23, 112202 (2011). doi:10.1088/0953-8984/23/11/112202

    ADS  Article  Google Scholar 

  33. 33.

    Niedziela, J. L., McGuire, M. A., Egami, T.: Phys. Rev. B 86, 174113 (2012). doi:10.1103/PhysRevB.86.174113

    ADS  Article  Google Scholar 

  34. 34.

    Joseph, B., Marini, C., Demitri, N., et al.: Supercond. Sci. Technol. 28, 092001 (2015). doi:10.1088/0953-2048/28/9/092001

    ADS  Article  Google Scholar 

  35. 35.

    In: Prins, R., Koningsberger, D. (eds.) : X-ray absorption: principles, applications, techniques of EXAFS, SEXAFS, XANES. Wiley, New York (1988)

  36. 36.

    Bianconi A., Bachrach, R.: Phys. Rev. Lett. 42, 104 (1979). doi:10.1103/physrevlett.42.104.

    ADS  Article  Google Scholar 

  37. 37.

    Bianconi, A., Missori, M., Oyanagi, H., Yamaguchi, H., Nishiara, Y., Della Longa, S.: Europhys. Lett. (EPL) 31, 411 (1995). doi:10.1209/0295-5075/31/7/012

    ADS  Article  Google Scholar 

  38. 38.

    Bianconi, A., L. Saini, N., Lanzara, A., Missori, M., Rossetti, T., Oyanagi, H., Yamaguchi, H., Oka, K., Ito, T.: Phys. Rev. Lett. 76, 3412 (1996). doi:10.1103/PhysRevLett.76.3412.

    ADS  Article  Google Scholar 

  39. 39.

    Ricci, A., Joseph, B., Poccia, N., Xu, W., Chen, D., Chu, W. S., Wu, Z. Y., Marcelli, A., Saini, N., Bianconi, A.: Supercond. Sci. Technol. 23, 052003 (2010). doi:10.1088/0953-2048/23/5/052003

    ADS  Article  Google Scholar 

  40. 40.

    Poccia, N., Ricci, A., Bianconi, A.: Adv. Condens. Matter Phys. 2010, 261849 (2010). doi:10.1155/2010/261849

    Article  Google Scholar 

  41. 41.

    Caivano, R., Fratini, M., Poccia, N., et al.: Supercond. Sci. Technol. 22, 014004 (2009). doi:10.1088/0953-2048/22/1/014004

    ADS  Article  Google Scholar 

  42. 42.

    Bianconi, A.: Nat. Phys. 9, 536 (2013). doi:10.1038/nphys2738.

    MathSciNet  Article  Google Scholar 

  43. 43.

    Bianconi, A.: Int. J. Mod. Phys. B 14, 3289 (2000). doi:10.1142/S0217979200003769

    ADS  Article  Google Scholar 

  44. 44.

    Campi, G., Bianconi, A., Poccia, N., et al.: Nature 525, 359 (2015). doi:10.1038/nature14987

  45. 45.

    Kugel, K., Rakhmanov, A., Sboychakov, A., Poccia, N., Bianconi, A.: Phys. Rev. B 78, 165124 (2008). doi:10.1103/physrevb.78.165124

    ADS  Article  Google Scholar 

  46. 46.

    Bianconi, A., Poccia, N., Sboychakov, A. O., Rakhmanov, A. L., Kugel, K. I.: Supercond. Sci. Technol 28, 024005 (2015). doi:10.1088/0953-2048/28/2/024005

    ADS  Article  Google Scholar 

  47. 47.

    Wang C., et al.: Phys. Rev. B 79, 054521 (2009). doi:10.1103/PhysRevB.79.054521

    ADS  Article  Google Scholar 

  48. 48.

    Qureshi, N., Drees, Y., Werner, J., Wurmehl, S., Hess, C., Klingeler, R., Büchner, B., Dıaz, M. T. F., Braden, M.: Phys, Rev. B 82, 184521 (2010). doi:10.1103/PhysRevB.82.184521.

    ADS  Article  Google Scholar 

  49. 49.

    McGuire, M.A., et al.: Phys. Rev. B 78, 094517 (2008)

    ADS  Article  Google Scholar 

  50. 50.

    Wang, L., et al.: Phys. Rev. B 80, 094512 (2009). doi:10.1103/PhysRevB.80.094512

    ADS  Article  Google Scholar 

  51. 51.

    Klingeler, R., Leps, N., Hellmann, I., Popa, A., Stockert, U., Hess, C., Kataev, V., Grafe, H.J., Hammerath, F., Lang, G., et al.: Phys. Rev. B 81, 024506 (2010). doi:10.1103/PhysRevB.81.024506.

    ADS  Article  Google Scholar 

  52. 52.

    Liu, C., et al.: Phys. Rev. B 82, 075135 (2010). doi:10.1103/PhysRevB.82.075135

    ADS  Article  Google Scholar 

  53. 53.

    Ishida, Y., Shimojima, T., Ishizaka, K., et al.: Phys. Rev. B 79, 060503 (2009). doi:10.1103/PhysRevB.79.060503

    ADS  Article  Google Scholar 

  54. 54.

    Lee, C.C., Yin, W.G., Ku, W.: Phys. Rev. Lett. 103, 267001 (2009). doi:10.1103/PhysRevLett.103.267001

    ADS  Article  Google Scholar 

  55. 55.

    Han, M.J., Yin, Q., Pickett, W.E., Savrasov, S.Y.: Phys. Rev. Lett. 102, 107003 (2009). doi:10.1103/PhysRevLett.102.107003

    ADS  Article  Google Scholar 

  56. 56.

    Lang, G., Grafe, H.J., Paar, D., et al.: Phys. Rev. Lett. 104, 097001 (2010). doi:10.1103/PhysRevLett.104.097001

    ADS  Article  Google Scholar 

  57. 57.

    Wu, T., Ying, J. J., Wu, G., Liu, R. H., He, Y., Chen, H., Wang, X. F., Xie, Y. L., Yan, Y. J., Chen, X. H.: Phys. Rev. B 79, 115121 (2009). doi:10.1103/PhysRevB.79.115121

    ADS  Article  Google Scholar 

  58. 58.

    Park, J.T., Inosov, D.S., Niedermayer, C., et al.: Phys. Rev. Lett. 102, 117006 (2009). doi:10.1103/PhysRevLett.102.117006

    ADS  Article  Google Scholar 

  59. 59.

    Bendele, M., Barinov, A., Joseph, B., et al.: Scientific Reports 4. 5592. doi:10.1038/srep05592 (2014)

  60. 60.

    Ricci, A., Poccia, N., Joseph, B., et al.: Phys. Rev. B 91, 020503 (2015). doi:10.1103/PhysRevB.91.020503

    ADS  Article  Google Scholar 

Download references


We thank Y-Q Yan, R. W. McCallum and T. A. Lograsso for providing us the single crystals. We thank ESRF for the beam time allocation and Dr. O. Mathon of BM-23 for his help in the EXAFS data collection. V.G.I. and A.P.M. thank the Russian Science Foundation (project 14-22-00098) for the support.

Author information



Corresponding author

Correspondence to Antonio Bianconi.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Joseph, B., Ricci, A., Poccia, N. et al. Temperature-Dependent As K-Edge EXAFS Studies of LaFe 1−x Co x AsO (x = 0.0 and 0.11) Single Crystals. J Supercond Nov Magn 29, 3041–3047 (2016).

Download citation


  • Fe based superconductors
  • Fe-As bond correlations
  • Local structure