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FeSe single crystals have been studied by soft point-contactAndreev-reflection spectroscopy. Superconducting gap features in thedifferential resistance dV/dI(V) of point contacts such as a characteristicAndreev-reflection double-minimum structure have been measured versustemperature and magnetic field. Analyzing dV/dI within the extended two-gapBlonder-Tinkham-Klapwijk model allows to extract both the temperature andmagnetic field dependence of the superconducting gaps. The temperaturedependence of both gaps is close to the standard BCS behavior. Remarkably, themagnitude of the double-minimum structure gradually vanishes in magnetic field,while the minima position only slightly shifts with field indicating a weakdecrease of the superconducting gaps. Analyzing the dV/dI(V) spectra for 25point contacts results in the averaged gap values <Delta_L> = 1.8+/-0.4meV and<Delta_S>=1.0+/-0.2 meV and reduced values 2<Delta_L>/kTc=4.2+/-0.9 and2<Delta_S>/kTc=2.3+/-0.5 for the large (L) and small (S) gap, respectively.Additionally, the small gap contribution was found to be within tens of percentdecreasing with both temperature and magnetic field. No signatures in the dV/dIspectra were observed testifying a gapless superconductivity or presence ofeven smaller gaps.

The superconducting gaps in FeSe studied by soft point-contact Andreev reflection spectroscopy