Abstract
We have developed a system for performing optical-pumping and double-resonance NMR of semiconductors simultaneously or sequentially. The components include a cryosystem equipped with a Gifford–McMahon (GM) cryocooler, which cools the samples via thermal contact. The following benefits are derived from this feature. (1) A pickup coil and tank circuits for NMR can be built in a vacuum, which excludes rf discharges and/or arcing (breakdown) occurring in conventional systems employing a helium-gas atmosphere, allowing application of the stronger and more stable rf-pulses required for broad-line double-resonance NMR. (2) Heat around a sample generated by light irradiation can be drained through the thermal connection to a heat anchor, permitting the use of a light-power high enough to achieve large nuclear polarization by optical pumping. (3) A bottom-loading style can be adopted for the installation of a cryostat and a probe to an NMR magnet, allowing a more compact system.
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