| Autor: |
Rivadulla, F., Sande, P., Causa, M. T., Hueso, L. E., López-Quintela, M. A., Rivas, J. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 6/1/2001, Vol. 89 Issue 11, p7422, 3p, 1 Diagram, 1 Chart, 3 Graphs |
| Abstrakt: |
Spin dynamics of the Mn-site substituted colossal magnetoresistance system were studied by means of electron paramagnetic resonance (EPR) and dc magnetic susceptibility in La[sub 2/3]Ca[sub 1/3]Mn[sub 1-x]Co[sub x]O[sub 3] (0≤x≤0.1,Δx=0.025). A dramatic increase in the high temperature limiting value for the EPR linewidth (ΔH[sub pp](∞)) was observed with doping. Structural analysis revealed that only negligible changes are produced in bond distances and angles at these low doping levels. On the other hand, dipolar contribution to ΔH[sub pp](∞) was estimated in a few Gauss. To explain the effect of doping on ΔH[sub pp](∞), we propose here a scenario including fast Mn-spin lattice relaxation through paramagnetic Co ions. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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