2007 年 76 巻 12 号 p. 124601
To study the isotope effect of glycinium phosphite (GPI), temperature dependences of the 50\\bar6 and 30\\bar10 structure factors of GPI and the 110\\bar3 and 90\\bar8 structure factors of deuterated GPI (DGPI) were analyzed in the ferroelectric phase by using the quasi-one-dimensional Ising model. The Ising model reproduces well the behavior of all the structure factors in the wide temperature region. The parameters for the intrachain and interchain interactions are determined to be 312 and 7.1 K for GPI, and 477 and 8.4 K for DGPI on average, respectively.
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