Rotating sample holder for ESR studies of relatively high conductivity, thin samples

Abstract

We have designed a low-loss dielectric sample holder for positioning very thin, metallic, semiconductor samples in a TE102 cavity for ESR studies at liquid-helium temperatures. The sample holder can be rotated ±15° from the center position, allowing accurate positioning of the high-conductivity sample at minimum electric field. This results in maximizing the Q factor and allowing symmetric excitation on both faces of the sample. We have also devised a method of setting the microwave phase to desired value to better than 0.3° by utilizing the hyperfine lines of a dilute As-doped Si sample.