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Utilizing difference in temperature dependencies we decoupled BCS andresidual components of the microwave surface resistance of superconductingniobium at all rf fields up to $B_\mathrm{rf}\sim110$ mT. We reveal that theresidual resistance decreases with field at $B_\mathrm{rf} \lesssim$ 40 mT andstrongly increases in chemically treated niobium at $B_\mathrm{rf} > 80$ mT. Wefind that BCS surface resistance is weakly dependent on field in the cleanlimit, whereas a strong and peculiar field dependence emerges after$120^\circ$C vacuum baking.

Dependence of the microwave surface resistance of superconducting niobium on the magnitude of the rf field