Cs collisional frequency shift measurements in microcells filled with a Ne-Ar buffer gas mixture

We report on the measurement of the dependence on temperature of the Cs clock frequency in microfabricated vapor cells filled with a mixture of Ne and Ar through the detection of Coherent Population Trapping (CPT) resonances. The temperature-dependence reduction of the Cs clock frequency is demonstrated in various cells. The inversion temperature at which the Cs clock frequency sensitivity is greatly reduced is found to be only dependent on the partial pressure of buffer gases and is measured to be lower than 80°C as expected with simple theoretical calculations.