Unusual relaxation dynamics in La{sub 1-x}Ca{sub x}MnO{sub 3}(X=0.33 and 0.67)

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Muon spin relaxation studies on powders of this system show that the 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, T{sub N}=150 K for x=0. 67). This suggests a spatially inhomogeneous distribution of very slow Mn-ion correlation times characteristic of diffusive relaxational dynamics. An anomalously small applied field destroys the dynamical signature of the (ferro)magnetic transition in x=0.33, but not the (antiferro)magnetic transition in x=0.67. The x=0.67 system also shows evidence for a change in the magnetic phase in zero field near 75 K.

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8 p.

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Heffner, R. H.; Le, L.; MacLaughlin, D. E.; Luke, G. M.; Kojima, K.; Nachumi, B. et al. July 1996.

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Description

Muon spin relaxation studies on powders of this system show that the 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, T{sub N}=150 K for x=0. 67). This suggests a spatially inhomogeneous distribution of very slow Mn-ion correlation times characteristic of diffusive relaxational dynamics. An anomalously small applied field destroys the dynamical signature of the (ferro)magnetic transition in x=0.33, but not the (antiferro)magnetic transition in x=0.67. The x=0.67 system also shows evidence for a change in the magnetic phase in zero field near 75 K.

Physical Description

8 p.

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OSTI as DE96014652

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  • Strongly correlated electron systems (SCES `96), Zurich (Switzerland), 19-22 Aug 1996

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  • Other: DE96014652
  • Report No.: LA-UR--96-2785
  • Report No.: CONF-9608119--5
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 401045
  • Archival Resource Key: ark:/67531/metadc682934

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  • July 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 26, 2016, 9:34 p.m.

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Heffner, R. H.; Le, L.; MacLaughlin, D. E.; Luke, G. M.; Kojima, K.; Nachumi, B. et al. Unusual relaxation dynamics in La{sub 1-x}Ca{sub x}MnO{sub 3}(X=0.33 and 0.67), article, July 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc682934/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.