Abstract
Using perturbed {gamma}{gamma} angular correlations of {sup 111}In in the La site, we report a structurally disordered phase in oxygen stoichiometric La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4+{delta}}. So far this phase has been defined for 0{le}{ital x}{le}0.07, involves a reversible order-disorder transition at {ital T}{sub {ital d}}=150(20) K, and is observed by changes in the electric-field gradient (EFG). These changes involve a continuous {ital broadening} of the EFG distribution and {ital decrease} of the average EFG asymmetry parameter as {ital T}{r arrow}0. The new disordered phase is associated with a loss of three dimensional magnetic order in the range 0.015{lt}{ital x}{lt}0.018, and may be due to short-range disorder in the tilting of the CuO{sub 6} octahedra as proposed by Egami {ital et} {ital al}.
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