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The Knight shift and the nuclear spin-lattice relaxation rate 1/T1 of Ga-71nuclei are measured in GaAs quantum wells at Landau level filling factor nu =1/2 using optically pumped NMR. The temperature dependences of these data arecompared with predictions of a weakly-interacting composite fermion model. Ourmeasurements of the electron spin polarization and spin dynamics near thetransition between fully and partially spin-polarized ground states provide newconstraints on the theoretical description of nu = 1/2.Comment: 4 pages (REVTEX), 4 eps figures embedded in tex

physical review letters

Optically Pumped NMR Studies of Electron Spin Polarization and Dynamics: New Constraints on the Composite Fermion Description of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">ν</mml:mi><mml:mspace /><mml:mo>=</mml:mo><mml:mspace /><mml:mn>1</mml:mn><mml:mn /><mml:mi>/</mml:mi><mml:mn>2</mml:mn></mml:math>

Optically Pumped NMR Studies of Electron Spin Polarization and Dynamics: New Constraints on the Composite Fermion Description ofν=1/2