Unusual relaxation dynamics in La{sub 1-x}Ca{sub x}MnO{sub 3}(X=0.33 and 0.67)
Conference
·
OSTI ID:401045
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.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 401045
- Report Number(s):
- LA-UR--96-2785; CONF-9608119--5; ON: DE96014652; CNN: NSF Grant DMR-94-18991; NSF Grant DMR-95-10454
- Country of Publication:
- United States
- Language:
- English
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