We have performed direct measurements of the heat generated in vacuumbarrier tunneling junction (TJ) electrode(s) at temperatures ≈5.3 K. The heat power generated in the positive electrode is greater than the one in the negative electrode, giving in the sum the value equal to the electrical power dissipated in the volume of the electrically equivalent resistor replacing TJ. In the framework of the proposed model, the asymmetry originates from different inelastic electron processes in the separate TJ electrodes that accompany the process of elastic electron tunneling. PACS nrs.:73.40.Gk, 34.80.-i, 73.40.RW, 73.90.+f, 07.79.-v 1 The tunneling spectroscopy is the way how to obtain the energy-spectroscopic information from careful measurements of the current-voltage characteristics . Besides probably the most important application based on direct measurements of differential electrical conductance dI/dV (which measures the density of states) also a second type of energy spectroscopy (detecting an inelastic excitation threshold)
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