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Probing the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mtext>Yb</mml:mtext></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>spin relaxation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mtext>Y</mml:mtext><mml:mrow><mml:mn>0.98</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Yb</mml:mtext></mml:mrow><mml:mrow><…
The relaxation of ${\text{Yb}}^{3+}$ in ${\text{YBa}}_{2}{\text{Cu}}_{3}{\text{O}}_{x}$ $(6<x<7)$ was studied using electron paramagnetic resonance. It was found that both electronic and phononic processes contribute to the ${\text{Yb}}^{3+}$ relaxation. The phononic part of the relaxation has an exponential temperature dependence, which can be explained by a Raman process via the coupling to …