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Localized spin excitations and destruction of the long-range magnetic order in a weakly doped LCO.

[In Russian. / En russe.]

Author(s) : IVANOV M. A., LOKTEV V. M., POGORELOV Ju. G.

Type of article: Article

Summary

In the framework of the microscopic model, the spin states in LCO with the small amount of dopants (acceptors) were analyzed. The long-range indirect coupling via the exchange of virtual magnons in the antiferromagnetic CuO(2) planes was studied for the spins of holes localized near acceptors of various types. In the dielectric phase region this coupling was shown to be alternating and failed in the long-range spin order for the system of the randomly distributed holes, but is insufficient for the effective destruction of the long-range antiferromagnetic order in the Cu(2)+ spin system. The mechanism is proposed for such destruction due to the magnetic anisotropy fluctuations as a result of the random strains induced by impurity ions. The phase diagram of the system was found.

Details

  • Original title: [In Russian. / En russe.]
  • Record ID : 1993-1240
  • Languages: Russian
  • Source: Z. eksp. teor. Fiz. - vol. 101 - n. 2
  • Publication date: 1992/02
  • Document available for consultation in the library of the IIR headquarters only.

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