Soliton Dynamics in Impure Ising-like Antiferromagnetic Chains
Solitons in one-dimensional magnetic systems have recently been receiving considerable interest. The soliton behaves like a free particle when the mean free path λ is much longer than the inverse of the soliton density ns (“coherent model”). On the contrary, if the condition nsλ<<l holds due to scatterings from impurities or defects, the soliton moves diffusively (“incoherent model”). Experimetal evidence for such behavior was first presented with regard to the sine-Gordon soliton in TMMC doped with Cu2+ or Cd2+ by the 14N nuclear relaxation experiment by BOUCHER et al.[l]. The purpose of the present work is to study from the nuclear magnetic relaxation the behavior of the soliton (propagating domain boundary) in impure Ising-like antiferromagnetic chain of S=l/2 in the hexagonal compound CsCoCl3. This compound exhibits successive phase transitions due to the frustration effect at TN1=22K and TN2=9K. Short range order is well developed above TN1, and, in the intermediate phase (TN2<T<TN1), one-third of the magnetic chains still remain disordered. The presence of the coherent soliton in CsCoCl3 for T>TN2 has been shown by the experiments of ESR  and neutron scattering .
KeywordsFrustration Effect Coherent Model Soliton Model Magnetic Chain Nuclear Magnetic Relaxation
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