Magnetic extrema in electronic susceptibility and heat capacity of mesoscopic systems

Oscillating behaviour of the susceptibility χ and heat capacity C is considered for normal and superconducting mesoscopic systems (nanoclusters and quantum dots). It is proved that at low temperature an increasing magnetic field applied to a mesoscopic system generates local extrema of χ and C. A maximum for χ and a minimum for C simultaneously arise in those points of the field where crossings of quantum levels of the normal and superconducting mesoscopic systems take place.