Magnetism of the LTT phase of Eu doped La_{2-x}Sr_xCuO_4

Details Magnetism of the LTT phase of Eu doped La_{2-x}Sr_xCuO_4 Magnetism of the LTT phase of Eu doped La_{2-x}Sr_xCuO_4

1997-03-19

arxiv.org/abs/cond-mat/9703177v1

Physics

Condensed Matter

Superconductivity

7 pages, RevTex, 3 eps figures. To appear in the Proceedings of the International Conference "Stripes, Lattice Instabilities a

Scientific paper

10.1007/BF02765736

The ESR signal of Gd spin probes (0.5 at %) as well as the static normal state susceptibility of Eu (J(Eu^{3+})=0) doped La_{2-x-y}Sr_xEu_yCuO_4 reveal pronounced changes of the Cu magnetism at the structural transition from the orthorhombic to the low temperature tetragonal phase for all non-superconducting compositions. Both a jumplike decrease of \chi as well as the ESR data show an increase of the in-plane magnetic correlation length in the LTT phase. From the Gd^{3+} ESR linewidth we find that for specific Eu and Sr concentrations in the LTT phase the correlation length increases up to more than 100 lattice constants and the fluctuation frequency of the CuO_2 spin system slows down to 10^{10}- 10^{11}sec^{-1}. However, there is no static order above T ~ 8K in contrast to the LTT phase of Nd doped La_{2-x}Sr_xCuO_4 with pinned stripe correlations.

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