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The complex surface impedance of a number of GdBa$_2$Cu$_3$O$_{7-\delta}$single crystals has been measured at 10, 15 and 21 GHz using a cavityperturbation technique. At low temperatures a marked increase in the effectivepenetration depth and surface resistance is observed associated with theparamagnetic and antiferromagnetic alignment of the Gd spins. The effectivepenetration depth has a sharp change in slope at the N\'eel temperature, $T_N$,and the surface resistance peaks at a frequency dependent temperature below 3K.The observed temperature and frequency dependence can be described by a modelwhich assumes a negligibly small interaction between the Gd spins and theelectrons in the superconducting state, with a frequency dependent magneticsusceptibility and a Gd spin relaxation time $\tau_s $ being a strong functionof temperature. Above $T_N$, $\tau_s$ has a component varying as $1 / (T -T_N)$, while below $T_N$ it increases $\sim T^{-5}$.Comment: 4 Pages, 4 Figures. Submitted to Phys. Rev.

physical review. b, condensed matter

Antiferromagnetic alignment and relaxation rate of Gd spins in the high temperature superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">GdBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi …

Antiferromagnetic alignment and relaxation rate of Gd spins in the high temperature superconductorGdBa2Cu3