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We report a high-pressure study of simultaneous low-temperature electricalresistivity and Hall effect measurements on high quality single-crystallineKFe2As2 using designer diamond anvil cell techniques with applied pressures upto 33 GPa. In the low pressure regime, we show that the superconductingtransition temperature T_c finds a maximum onset value of 7 K near 2 GPa, incontrast to previous reports that find a minimum T_c and reversal of pressuredependence at this pressure. Upon applying higher pressures, this T_c isdiminished until a sudden drastic enhancement occurs coincident with afirst-order structural phase transition into a collapsed tetragonal phase. Theappearance of a distinct superconducting phase above 13 GPa is also accompaniedby a sudden reversal of dominant charge carrier sign, from hole- toelectron-like, which agrees with our band calculations predicting the emergenceof an electron pocket and diminishment of hole pockets upon Fermi surfacereconstruction. Our results suggest the high-temperature superconducting phasein KFe2As2 is substantially enhanced by the presence of nested electron andhole pockets, providing the key ingredient of high-T_c superconductivity iniron pnictide superconductors.

High-temperature superconductivity stabilized by electron-hole interband coupling in collapsed tetragonal phase of KFe2As2 under high pressure