计算顺磁-铁磁相变临界磁场的一种方法
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摘要
利用线性自旋波方法并结合Hellmann-Feynman定理引入一种计算量子磁性系统临界磁场的方法.计算两种特殊模型的临界磁场,并将理论结果与数值结果进行比较,理论值与数值结果高度吻合,验证了理论方法的准确性.
Based on linear spin wave approximation and Hellmann-Feynman theorem, we introduce a method to calculate critical magnetic field where the ground state transforms into a fully polarized ferromagnetism as magnetic field is applied. To confirm our method, we apply it to two models and compare results with numerical data.
Based on linear spin wave approximation and Hellmann-Feynman theorem, we introduce a method to calculate critical magnetic field where the ground state transforms into a fully polarized ferromagnetism as magnetic field is applied. To confirm our method, we apply it to two models and compare results with numerical data.
引文
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[2] CHENG R,OKAMOTO S,XIAO D.Spin Nernst effect of magnons in collinear antiferromagnets[J].Physical Review Letters,2016,117(21):217202.
[3] BLOCH F.Zur theorie des ferromagnetismus[J].Zeitschrift Für Physik,1930,61(3-4):206-219.
[4] SlATER J C.Cohesion in monovalent metals[J].Physical Review,1930,35(5):509-529.
[5] HOLSTEIN T,PRIMAKOFF H.Field dependence of the intrinsic domain magnetization of a ferromagnet[J].Physical Review,2001,58(12):1098-1113.
[6] FEYNMAN R P.Forces in molecules[J].Physical Review,1939,56(4):340-343.
[7] BOGOLJUBOV N N.On a new method in the theory of superconductivity[J].IL Nuovo Cimento,1958,7(6):794-805.
[8] NOLTING W,RAMAKANTH A.Quantum theory of magnetism[M].Science Press,2008.
[9] NAMBU Y.Quasi-particles and gauge invariance in the theory of superconductivity[M]//Broken Symmetry:Selected Papers of Y Nambu,1960:91-106.
[10] GOLDSTONE J.Field theories with superconductor solutions[J].IL Nuovo Cimento,1961,19(1):154-164.
[11] KIMURA K,SERA M,KIMURA T.A2+ cation control of chiral domain formation in A(TiO)Cu4(PO4)4 (A=Ba,Sr)[J].Inorganic Chemistry,2016,55(3).
[12] MORIYA T.Anisotropic superexchange interaction and weak ferromagnetism[J].Physical Review,1960,120(1):91.
[13] YASUYUKI K,KENTA K,ATSUSHI M,et al.Magnetoelectric behavior from S=1/2 asymmetric square cupolas[J].Phys Revs Lett,2017,118(10):107601.