The temperature dependence of the London penetration depth, 1(T), has been determined by measuring the low-field magnetisation for RBa,Cu,O,-, samples, where R = Y and Gd. The 1(0) value obtained from the magnetic measurement was about 0.6 pm for both GdBa,Cu,O,-, and YBa,Cu,O,-,. The 1(T) was compared with the empirical law: i.(T) = A(O)[1 -(T/T,J4]-'". The results are discussed.
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