Abstract
We have observed two-dimensional magnetic behavior associated with the magnetic ordering of Dy in DyBa 2Cu 3O 7, and have studied the 2D magnetic correlations of Dy in DyBa 2Cu 3O 7 as well as Er in ErBa 2Cu 3O 7. The temperature dependence of the rod of scattering, characteristic of 2D behavior, has been measured above and below the Néel temperature ( T N⋍0.9 K for Dy, T N⋍0.62 K for Er). For both systems the rod intensity, which is proportional to the magnetic susceptibility, is observed to increase as the temperature is decreased until T N is reached. Below T N the intensity decreases rapidly. The 2D magnetic correlation length is seen to grow continuously with decreasing temperature and then peak at the respective Néel temperatures when long range magnetic order sets in.
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