View PDF Version
 
DOI: 10.1039/A807978A (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1999, 623-628

Chemical size effect on the magnetic and electrical properties of colossal magnetoresistance La1.2(Sr1.8 – xCax)Mn2O7 materials

(Note: The full text of this document is currently only available in the PDF Version )

Ru-Shi Liu, Chih-Hung Shen, Jauyn Grace Lin, Chao-Yuan Huang, Jin-Ming Chen and Ru-Gun Liu

Abstract

Chemical size effects on the magnetic and electrical properties of the colossal magnetoresistance La1.2(Sr1.8 – xCax)Mn2O7 materials have been investigated. Based on the chemical shifts of the first unoccupied excited states in the core-level X-ray absorption spectrum correlated to the charge, the valence of Mn has been determined to be 3.43 ± 0.05 for all x in La1.2(Sr1.8 – xCax)Mn2O7. The magnetoresistance ratio [ρ(0)/ρ(H[hair space])] can be efficiently increased from ≈192% (135 K, 1.5 T) for x = 0 to 208% (102 K, 1.5 T) for x = 0.4. On further increase in the concentration of Ca (x = 0.6 and 0.8) the samples only show a spin-glass behavior.

References

  1. Y. Moritomo, A. Asamitsu, H. Kuwahara and Y. Tokura, Nature (London), 1996, 380, 141 CrossRef CAS.
  2. C. N. R. Rao, P. Ganguly, K. K. Sing and R. A. Mohan Ram, J. Solid State Chem., 1988, 72, 14 CrossRef CAS.
  3. Y. Moritomo, Y. Tomioka, A. Asamitsu, Y. Tokura and Y. Matsui, Phys. Rev. B, 1995, 51, 3279.
  4. R. Mahesh, R. Mahendiran, A. K. Raychaudhuri and C. N. R. Rao, J. Solid State Chem., 1996, 122, 448 CrossRef CAS.
  5. R. Seshadri, C. Martin, M. Hervieu, B. Raveau and C. N. R. Rao, Chem. Mater., 1997, 9, 270 CrossRef CAS.
  6. J. F. Mitchell, D. N. Argyriou, J. D. Jorgensen, D. G. Hinks, C. D. Potter and S. D. Bader, Phys. Rev. B, 1997, 55, 63 CrossRef CAS.
  7. D. N. Argyriou, J. F. Mitchell, J. B. Goodenough, O. Chmaissem, S. Short and J. D. Jorgensen, Phys. Rev. Lett., 1997, 78, 1568 CrossRef CAS.
  8. R. Seshadri, M. Hervieu, C. Martin, A. Maignan, B. Domenges and B. Raveau, Chem. Lett., 1997, 9, 1778 CrossRef CAS.
  9. J. Sloan, P. D. Battle, M. A. Green, M. J. Rosseinsky and J. F. Vente, J. Solid State Chem., 1998, 138, 135 CrossRef CAS.
  10. A. C. Larson and R. B. Von Dreele, GSAS, Generalized Structure Analysis System, Los Alamos National Laboratory, Los Alamos, NM, 1994.
  11. P. D. Battle, M. A. Green, N. S. Laskey, J. E. Millburn, P. G. Radaelli, M. J. Rosseinsky, S. P. Sullivan and J. F. Vente, Phys. Rev. B, 1996, 54, 15967 CrossRef CAS.
  12. P. D. Battle, J. A. Hepburn, J. E. Millburn, P. G. Radaelli, M. J. Rosseinsky, L. E. Spring and J. F. Vente, Chem. Mater., 1997, 9, 3215 CrossRef CAS.
  13. R. Seshadri, C. Martin, A. Maignan, M. Hervieu, B. Raveau and C. N. R. Rao, J. Mater. Chem., 1996, 6, 1585 RSC.
  14. R. D. Shannon, Acta Crystallogr., Sect. A, 1976, 32, 751 CrossRef.
  15. A. T. Carlson, Photoelectron and Auger Spectroscopy, Plenum, New York, 1975 Search PubMed.
  16. R. Seshadri, A. Maignan, M. Hervieu, N. Nguyen and B. Raveau, Solid State Commun., 1997, 101, 453 CrossRef CAS.
Click here to see how this site uses Cookies. View our privacy policy here.