Current-voltage characteristics of long superconducting microbridges of variable thickness and with a normal bank

Current states of a doubly connected superconductor with two point contacts

“…Before discussing a mechanism of the appearance of these SOs, it is necessary to note that different types of current and voltage self-oscillations in structures with superconductors fed by a direct current have been investigated for more than half a century. [11][12][13][14][15][16][17][18][19][20][21][22][23][24] The types can be divided into two groups. To the first belong SOs with specified frequency and amplitude, [11][12][13][14][15][16][17][18][19][20][21][22] to the second-chaotic and, as a rule, low-frequency SOs, amplitude and frequency of which vary in time randomly.…”

“…[11][12][13][14][15][16][17][18][19][20][21][22][23][24] The types can be divided into two groups. To the first belong SOs with specified frequency and amplitude, [11][12][13][14][15][16][17][18][19][20][21][22] to the second-chaotic and, as a rule, low-frequency SOs, amplitude and frequency of which vary in time randomly. 23,24 The current selfoscillations in our experiments belong to the first group.…”

Inversion ratio in trivalent-iron doped andalusite in the Q and V-bands

“…With this orientation, it is possible to use both andalusite magnetic complexes in the simplest way. However, analysis [2] of the ESR spectrum indicates that it is impossible, to obtain inversion of energy level populations in the frequency range 75-100 GHz because of the two-spin cross-relaxation (CR), since Vs ~ i 2 vp. vs , and vp are the signal and pump frequency, respectively, vs = V12, vp = V13 or v14.…”

“…To find out the influence of these MCR processes on the inversion ratio, it is necessary to know its frequency dependence in a wide frequency range. There are no sufficient experimental data [2,3] to determine the frequency dependence of I.…”