Random electron paramagnetic resonance sampling of the modulated structure in incommensurate phases of betaine calcium chloride dihydrate
作者： M. Fujimoto , Y. Kotake
DOI: 10.1063/1.456503
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摘要: The successive phase transitions in betaine calcium chloride dihydrate crystals were investigated the range between 300 and 100 K with VO2+ Mn2+ electron paramagnetic resonance (EPR) probes substituted for Ca2+ ions lattice. Preceded by B2u soft phonons normal phase, these are continuous, found to consist of stepwise changes a collective librational fluctuation Ca–betaine complexes. Below normal‐to‐incommensurate transition at 164 K, became slower than EPR frequencies so that spectra exhibited anomalous line shapes resulting from random sampling modulated structure. In addition, such anomalies as observed 9.2 36 GHz indicated clear evidence time‐dependent lattice modulation phases. Sampling results yielded complementary information about structure, which interpreted plane‐wave approximation anharmonic mode.
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