Phase and amplitude fluctuations near TI in the incommensurate phase of Rb2ZnCl4 : Mn2+ through E.P.R. investigations

A. Kaziba , J.C. Fayet

A computer treatment of the experimental spectra of the Mn2+ probe enables us to eliminate the irrelevant hyperfine structure and to reveal the shape of the fine structure lines in the incommensurate phase near TI. We analyse it by a simple model taking into account the critical amplitude, the local phase of the modulation wave and the spectral densities of their fluctuations. We conclude with the existence of large phase fluctuations near TI which tighten to reach below (T I - 4 K), a stationary regime marked by a substantial spectra density in the 1010 s-1 frequency range.

Mots clés: commensurate incommensurate transformations; manganese; paramagnetic resonance of iron group ions and impurities; rubidium compounds; zinc compounds

Domaines: Articles anciens

A. Kaziba, J.C. Fayet. Phase and amplitude fluctuations near TI in the incommensurate phase of Rb2ZnCl4 : Mn2+ through E.P.R. investigations. Journal de Physique, 1986, 47 (2), pp.239-248. ⟨10.1051/jphys:01986004702023900⟩. ⟨jpa-00210201⟩