Theory of Magnetic Excitations in Random Antiferromagnets. II. : Spin Waves in Rb_2T_xS_<1-x>F_4 and T_xS_<1-x>F_2 (T=Mn or Co and S=Mg,Zn,Co or Ni)
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概要
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The dispersion relation of excitations and the dynamic susceptil>ility z(q, cta)in the random antiferronaagnets Rb.7'..S')-.F,j and T.Sg-.F.; T =Mn or Coand .S'=Mg, Zn, Co or Ni, are systematically studied by using a theory developedin I, Some bands of excitations, each of which lies between two single site excita-lion energies, are obtained in those substances. The line shape of z(q, o) is shownto depend on both the separation of excitation energies and the relative intensityof those excitations which varies with wave vector 9. Our results explain theobserved scattering function S'(q, co) fairly well in both the line slnape and thedispersion relation of the energies at which peaks of S'(q, co) occur. The natureof those excitations is also studied by calculating susceptibilities<cf individualions.
- 社団法人日本物理学会の論文
- 1980-11-15
著者
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Matsubara Fumitaka
Department Of Applied Physics Faculty Of Engineering The University Of Tohoku
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Matsubara Fumitaka
Department of Engineering Science,Tohoku University
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