Fermi Surface of KFe2As2 from Quantum Oscillations in Magnetostriction
Abstract
We present a study of the Fermi surface of KFe2As2 single crystals. Quantum oscillations were observed in magnetostriction measured down to 50 mK and in magnetic fields H up to 14 T. For H c, the calculated effective masses are in agreement with recent de Haas-van Alphen and ARPES experiments, showing enhanced values with respect to the ones obtained from previous band calculations. For H a, we observed a small orbit at a cyclotron frequency of 64 T, characterized by an effective mass of 0.8 me, supporting the presence of a three-dimensional pocket at the Z-point.
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