A new method which is combined with the discretized path-integral by the two-spincluster expansion is employed in the study of the effect of a crystal field on the I(sing) model with spin-1 in a weak transverse-field.The analytic expressions of the free
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张学龙.弱横场S=1I_(sing)系统的晶场效应[J].重庆工商大学学报(自然科学版),1994,(2): Zhang Xuelong.[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),1994,(2):