Elastic and Quasi-Elastic Neutron Scattering from K_2MnF_4 near the Critical Point
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概要
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Elastic and quasi-elastic neutron scattering experiments on K_2MnF_4 single crystal which is a typical two-dimensional antiferromagnet with Heisenberg exchange interaction, have been carried out. From the measurements of the temperature variation of magnetic Bragg intensities, existence of two types of the magnetic structure (K_2NiF_4-type and Ca_2MnO_4-type) with different Neel temperatures T_N(42.37±0.02 K and 58.0±0.5 K, respectively) has been confirmed. The temperature variation of sublattice magnetization has been determined from the (1,0,0) magnetic Bragg inten-sity. The results can be expressed by a simple power law for 4.2 K<T<T_N with β=0.188±0.01. After the quasi-elastic scattering measurements, two-dimensional spin correlation is found to be long-range over all the critical region. The diverging nature of the correlation length among intra-planar spins κ^<-1> at T_N strongly suggests the two-dimensionality in this substance.
- 社団法人日本物理学会の論文
- 1972-08-05
著者
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HIRAKAWA Kinshiro
Institute for Solid State Physics,University of Tokyo
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Hirakawa Kinshiro
The Institute For Solid State Physics The University Of Tokyo
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Hirakawa Kinshiro
The Institute For Solid State Physics University Of Tokyo
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Ikeda Hironobu
The Institute For Solid State Physics The University Of Tokyo
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Ikeda Hironobu
The Institute For Solid State Physics University Of Tokyo
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Hirakawa Kinshiro
The Institute For State Physics The University Of Tokyo
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Hirakawa Kinshiro
The Institute Of Solid State Physics The University Of Tokyo
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Hirakawa Kinshiro
Instiute For Solid State Physics University Of Tokyo
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Hirakawa Kinshiro
Institure For Solid State Physics University Of Tokyo
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