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(a) Schematic diagram of dynamic nuclear polarization process caused by electron cooling and heating. (b) Schematic of the sample geometry.
(a) Time evolution of after applying dc currents (lower) and (upper) for . (b) Deviation of from the equilibrium value at as a function of applied for .
Longitudinal nuclear spin relaxation rate is shown together with the equilibrium value of . (a) Magnetic field dependence at . (b) Temperature dependence at .
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