Abstract
LiNH4C4H4O6·H2O (LAT) and LiKC4H4O6·H2O (LPT) crystals were studied in low temperature region. Anomalous low-lying mode has been observed in LAT and LPT. The results of Raman spectra indicate a phase transition of LPT at ∼50K, where the intensity of the anomalous low-lying mode vanishes and anomalous kinks are observed in temperature dependence of phonon frequencies. The phase transition of LPT has been confirmed by observation of a specific heat anomaly. Possible transition mechanism of LPT and the nature of the low-lying mode are discussed on the basis of comparison between LAT and LPT. It can be concluded that H2O motion plays an important role in the phase transition of LPT.
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