We investigated dc and ac susceptibilities of La1−xCaxMnO3 (x=0.2,0.3) single crystals. Obtained results show that La0.8Ca0.2MnO3 is clearly magnetically more frustrated than La0.7Ca0.3MnO3, indicating that charge/orbital fluctuation is enhanced in La0.8Ca0.2MnO3. A remarkable magnetic anomaly in the imaginary component of the ac susceptibility appears around 100 K for La0.8Ca0.2MnO3 to be attributed to the magnetic frustration arising from the strong competition between antiferromagnetic and ferromagnetic interactions that favor the existence of short-range charge/orbital ordering in this sample. In connection with the resistivity data, we propose that the order parameter of magnetic origin should be coupled to the other degrees of freedom in the case of La0.8Ca0.2MnO3 rather than La0.7Ca0.3MnO3.
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Phan et al. (2003) studied this question.