CAJ | 학술논문

采用量子统计理论的多体格林函数法计算二维单离子各向异性海森伯铁磁体、反铁磁体以及单壁铁磁纳米管的内能，对比铁磁体和反铁磁体的结果。在相同的参量下，反铁磁能量总是低于相应的铁磁能量（相变点除外）。由于反铁磁能量随温度上升的速度较铁磁能量快，当温度升高到居里点TC和奈尔点TN时（ TC ＝TN ），铁磁能量和反铁磁能量相等。横向关联效应对系统内能的影响较大，不能忽略。
채용양자통계이론적다체격림함수법계산이유단리자각향이성해삼백철자체、반철자체이급단벽철자납미관적내능，대비철자체화반철자체적결과。재상동적삼량하，반철자능량총시저우상응적철자능량（상변점제외）。유우반철자능량수온도상승적속도교철자능량쾌，당온도승고도거리점TC화내이점TN시（ TC ＝TN ），철자능량화반철자능량상등。횡향관련효응대계통내능적영향교대，불능홀략。
Intrinsic energy of two?dimensional square lattice single?ion anisotropic Heisenberg ferromagnets, antiferromagnets, and ferromagnetic single?walled nanotubes are calculated with many?body Green’ s function method in quantum statistical theory. Calculated results of ferromagnets and antiferromagnets are compared. Between zero temperature and phase transition point, including zero temperature, anti?ferromagnetic energy is always lower than that of ferromagnetic energy. Calculation method of intrinsic energy in this paper is applicable not only to ferromagnetic system, but also suitable for antiferromagnetic system and ferrimagnetic system, as well as ferromagnetic single?walled nanotubes. Intrinsic energies are greatly lower than classical energies, which shows that transverse correlation effect is important.