Anelastic spectroscopy study of the spin-glass and cluster spin-glass phases of La$_{2-x}$Sr$_{x}$CuO$_{4}$ $(0.015<x<0.03)$

Details Anelastic spectroscopy study of the spin-glass and cluster spin-glass phases of La$_{2-x}$Sr$_{x}$CuO$_{4}$ $(0.015<x<0.03)$ Anelastic spectroscopy study of the spin-glass and cluster spin-glass phases of La$_{2-x}$Sr$_{x}$CuO$_{4}$ $(0.015<x<0.03)$

2002-03-04

arxiv.org/abs/cond-mat/0203051v1

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.66.094503

The anelastic spectra of La$_{2-x}$Sr$_{x}$CuO$_{4}$ have been measured at liquid He temperatures slightly below and above the concentration $% x_{c}\simeq 0.02$ which is considered to separate the spin-glass phase from the cluster spin-glass (CSG) phase. For $x\le x_{c}$ all the elastic energy loss functions show a step below the temperature $T_{g}(x=0.02) $ of freezing into the CSG state, similarly to what found in samples well within the CSG phase, but with a smaller amplitude. The excess dissipation in the CSG state is attributed to the motion of the domain walls between the clusters of antiferromagnetically correlated spin. These results are in agreement with the recent proposal, based on inelastic neutron scattering, of an electronic phase separation between regions with $x\sim 0$ and $x\sim 0.02$, at least for $x>0.015$

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