ISSN:
1573-7357
Schlagwort(e):
74.25.Ha
;
74.72.Dn
;
76.30.Kg
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract We present the results of the ESR study on Gd spin probes of the spin dynamics of the CuO2 planes in the low temperature tetragonal (LTT) phase of La2−xSrxCuO4 which is stabilized below ≈ 110 – 130 K by doping this compound by Eu. Instead of the Korringa like behaviour occurred in the orthorhombic (LTO) phase at higher temperatures, Gd3+ ESR linewidth ΔH broadens considerably at low temperatures in the LTT phase. Maximal broadening of ΔH is observed for the samples with suppressed superconductivity. The analysis of the data shows that the spin correlation length ξ in the LTT phase rapidly increases at low temperatures and for non superconducting samples may exceed 100 lattice constants. Correspondingly, the frequency of the antiferromagnetic spin fluctuations decreases down to 1010 – 1011sec−1. It is argued that such extremely slow antiferromagnetic spin dynamics is a characteristic property of the magnetism in the LTT structural phase of La2−xSrxCu04.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00768427
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