2 1 N ov 1 99 6 Sr impurity effects on the magnetic correlations of La 2 − x Sr x CuO 4
نویسنده
چکیده
We examine the low–temperature magnetic properties of moderately doped La2−xSrxCuO4, paying particular attention to the spin–glass phase and the commensurate–incommensurate transition as they are affected by Sr impurity disorder. A model of the carriers, believed to be appropriate at low temperatures, is employed in the CuO2 planes that accounts for both the strong coupling of the hole’s motion to the antiferromagnetically correlated spins and the pinning potential associated the Sr impurities. This model has been shown to explain quantitatively several magnetic and transport features of the antiferromagnetic region of the phase diagram. Preliminary indications that this model can also explain the x ≥ 0.02 region of the phase diagram follow from its success in accounting for the doping and temperature variation of the spin correlation length. Here we further scrutinize this model by attempting to explain various features of the spin texture of the spin–glass phase. New measurements with travelling–solvent
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