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We report precision measurements of the Casimir interaction at largerseparation distances between the Au-coated surfaces of a sphere and a plate inultrahigh vacuum using a much softer cantilever of the dynamic atomic forcemicroscope-based setup and two-step cleaning procedure of the vacuum chamberand test body surfaces by means of UV light and Ar-ion bombardment. Compared tothe previously performed experiment, two more measurement sets for the gradientof the Casimir force are provided which confirmed and slightly improved theresults. Next, additional measurements have been performed with a factor of twolarger oscillation amplitude of the cantilever. This allowed obtainingmeaningful results at much larger separation distances. The comparison of themeasurement data with theoretical predictions of the Lifshitz theory using thedissipative Drude model to describe the response of Au to the low-frequencyelectromagnetic field fluctuations shows that this theoretical approach isexperimentally excluded over the distances from 250 to 1100nm (i.e., a majorstep forward has been made as compared to the previous work where it wasexcluded up to only 820nm). The theoretical approach using the dissipationlessplasma model at low frequencies is shown to be consistent with the data overthe entire measurement range from 250 to 1300nm. The possibilities to explainthese puzzling results are discussed.

Precision measurements of the gradient of the Casimir force between ultra clean metallic surfaces at larger separations