Magnetization distribution in the mixed-phase state of hole-doped manganites

Abstract

The effect of ‘colossal magnetoresistance’ (CMR) in hole-doped manganites—an abnormal decrease of resistivity when a magnetic field is applied1—has attracted significant interest from researchers in the past decade. But the underlying mechanism for the CMR phenomenon is not yet fully understood. It has become clear that a phase-separated state2,3,4,5,6, where magnetic and non-magnetic phases coexist, is important, but the detailed magnetic microstructure of this mixed-phase state is so far unclear. Here we use electron microscopy to study the magnetic microstructure and development of ferromagnetic domains in the mixed-phase state of La1-xSrxMnO3 (x = 0.54, 0.56). Our measurements show that, in the absence of a magnetic field, the magnetic flux is closed within ferromagnetic regions, indicating a negligible magnetic interaction between separated ferromagnetic domains. However, we also find that the domains start to combine with only very small changes in temperature. We propose that the delicate nature of the magnetic microstructure in the mixed-phase state of hole-doped manganites is responsible for the CMR effect, in which significant conduction paths form between the ferromagnetic domains upon application of a magnetic field.

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Figure 1: Temperature dependence of magnetization in La1-xSrxMnO3 (x = 0.54, 0.56).
Figure 2: Temperature dependence of the magnetic microstructure in the mixed-phase (ferromagnetic and antiferromagnetic) state in La0.44Sr0.56MnO3.
Figure 3: Temperature dependence of the magnetic microstructure in the mixed-phase (ferromagnetic and paramagnetic) state in La0.46Sr0.54MnO3.
Figure 4: Effect of beam heating on the magnetic microstructure in the mixed-phase state and the single-phase state in La0.44Sr0.56MnO3.

References

  1. 1

    Jin, S. et al. Thousandfold change in resistivity in magnetoresistive La-Ca-Mn-O films. Science 264, 413–415 (1994)

    ADS  CAS  Article  Google Scholar 

  2. 2

    Moreo, A., Yunoki, S. & Dagotto, E. Phase separation scenario for manganese oxides and related materials. Science 283, 2034–2039 (1999)

    CAS  Article  Google Scholar 

  3. 3

    Fäth, M. et al. Spatially inhomogeneous metal-insulator transition in doped manganites. Science 285, 1540–1542 (1999)

    Article  Google Scholar 

  4. 4

    Uehara, M., Mori, S., Chen, C. H. & Cheong, S.-W. Percolative phase separation underlies colossal magnetoresistance in mixed-valent manganites. Nature 399, 560–563 (1999)

    ADS  CAS  Article  Google Scholar 

  5. 5

    Mori, S., Chen, C. H. & Cheong, S.-W. Paired and unpaired charge stripes in the ferromagnetic phase of La0.5Ca0.5MnO3 . Phys. Rev. Lett. 81, 3972–3975 (1998)

    ADS  CAS  Article  Google Scholar 

  6. 6

    Lu, Q., Chen, C. C. & de Lozanne, A. Observation of magnetic domain behavior in colossal magnetoresistive materials with a magnetic force microscope. Science 276, 2006–2008 (1997)

    CAS  Article  Google Scholar 

  7. 7

    Anderson, P. W. & Hasegawa, H. Considerations on double exchange. Phys. Rev. 100, 675–681 (1955)

    ADS  CAS  Article  Google Scholar 

  8. 8

    de Gennes, P.-G. Effect of double exchange in magnetic crystals. Phys. Rev. 118, 141–154 (1960)

    ADS  CAS  Article  Google Scholar 

  9. 9

    Moreo, A., Mayr, M., Feiguin, A., Yunoki, S. & Dagotto, E. Giant cluster coexistence in doped manganites and other compounds. Phys. Rev. Lett. 84, 5568–5571 (2000)

    ADS  CAS  Article  Google Scholar 

  10. 10

    Mayr, M. et al. Resistivity of mixed-phase manganites. Phys. Rev. Lett. 86, 135–138 (2001)

    ADS  CAS  Article  Google Scholar 

  11. 11

    Zhang, L., Israel, C., Biswas, A., Greene, R. L. & de Lozanne, A. Direct observation of percolation in a manganite thin film. Science 298, 805–807 (2002)

    ADS  CAS  Article  Google Scholar 

  12. 12

    Kikuchi, K., Chiba, H., Kikuchi, M. & Syono, Y. Syntheses and magnetic properties of La1-xSrxMnO3 (0.5 < x < 1.0) perovskite. J. Solid State Chem. 146, 1–5 (1999)

    ADS  CAS  Article  Google Scholar 

  13. 13

    Urushibara, A. et al. Insulator-metal transformation and giant magnetoresistance in La1-xSrxMnO3 . Phys. Rev. B 51, 14103–14109 (1995)

    ADS  CAS  Article  Google Scholar 

  14. 14

    Akimoto, T. et al. Antiferromagnetic metallic state in doped manganites. Phys. Rev. B 57, R5594–R5597 (1998)

    ADS  CAS  Article  Google Scholar 

  15. 15

    Moritomo, Y., Akimoto, T., Nakamura, A., Ohoyama, K. & Ohashi, M. Antiferromagnetic state in the heavily doped region of perovskite manganites. Phys. Rev. B 58, 5544–5549 (1998)

    ADS  CAS  Article  Google Scholar 

  16. 16

    Tonomura, A. Electron Holography (Springer, Tokyo, 1999)

    Google Scholar 

  17. 17

    Shindo, D. & Oikawa, T. Analytical Electron Microscopy for Materials Science (Springer, Tokyo, 2002)

    Google Scholar 

  18. 18

    Loudon, J. C., Mathur, N. D. & Midgley, P. A. Charge-ordered ferromagnetic phase in La0.5Ca0.5MnO3 . Nature 420, 797–800 (2002)

    ADS  CAS  Article  Google Scholar 

  19. 19

    Rez, D., Rez, P. & Grant, I. Dirac-Fock calculations of X-ray scattering factors and contributions to the mean inner potential for electron scattering. Acta Crystallogr. A 50, 481–497 (1994)

    Article  Google Scholar 

Download references

Acknowledgements

We thank T. Ohsuna and Y. Gao for discussions. This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan, and by the Special Coordination Funds for Promoting Science and Technology of ‘Nanohetero Metallic Materials’ from the Science and Technology Agency.

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Correspondence to Y. Murakami.

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Murakami, Y., Yoo, J., Shindo, D. et al. Magnetization distribution in the mixed-phase state of hole-doped manganites. Nature 423, 965–968 (2003). https://doi.org/10.1038/nature01715

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