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Summaryï It is difficult to detect the local structural distortion ofMnO 6 octahedron in La-Ca-Mn-O perovskites by XRD.ï Mˆ ssbauer Spectra provide a clearly evidence for thelocal structural distortion.ï The Jahn-Teller coupling due to local structural distortioncan be determined by Mˆ ssbauer spectroscopy.ï Jahn-Teller effect play a key role in magnetic andtransport properties.