Abstract
Temperature dependent Mössbauer measurements are done on the samples of La1−x Ca x Mn1−y 57Fe y O3 with x=0 and 0.25, and y=0.01. With decreasing temperature, the specimen with x=0.25 shows a paramagnetic to ferromagnetic transition around 175 K. In the specimen x=0.0, the temperature dependence of both the center shift (δ) and the recoilless fraction (f) can be fitted very well with the Debye theory with a θ D=320±50 K. But for the specimens with x=0.25, f and δ show distinct deviations from the Debye behavior in the temperature range in which the resistivity shows a sharp decrease. Dips observed in both the f and δ around the transition temperature suggest that the Jahn–Teller distortion observed in these systems is dynamic in nature.
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Shah, P., Gupta, A., Sarma, D.D. et al. Mössbauer Study of La1−x Ca x Mn1−y 57Fe y O3 with x=0,0.25; y=0.01. Hyperfine Interactions 139, 623–629 (2002). https://doi.org/10.1023/A:1021239231963
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DOI: https://doi.org/10.1023/A:1021239231963