Unusual relaxational dynamics in La1-xCaxMnO3 (x = 0.33 and 0.67)

R. H. Heffner, L. P. Le, D. E. MacLaughlin, G. M. Luke, K. Kojima, B. Nachumi, Y. J. Uemura, G. J. Nieuwenhuys, S. W. Cheong

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Muon spin relaxation studies on La1-xCaxMnO3 (x = 0.33 and 0.67) powders show that the muon dynamic relaxation function changes from exponential above the magnetic transition temperature to stretched exponential below the critical temperature (TC = 274 K for x = 0.33, TN = 150 K for x = 0.67). This suggests a spatially inhomogeneous distribution of very slow Mn-ion correlation times. An anomalously small applied field destroys the dynamical signature of the ferromagnetic transition for x = 0.33, but not the antiferromagnetic transition for x = 0.67. The x = 0.67 system also shows the evidence of a change in the magnetic phase in zero field near T = 75 K.

Original languageEnglish (US)
Pages (from-to)759-761
Number of pages3
JournalPhysica B: Condensed Matter
StatePublished - Feb 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


  • LaCaMnO
  • Magnetoresistive oxides
  • Spin polarons
  • μSR spectroscopy


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