Magnetically modulated microwave absorption MMMA in investigation of superconductors

Microwave absorption in carbon-doped YNi4B superconductors

“…This is a commonly observed feature for granular superconductors and is usually explained by the fact that the MMMA maximum in the vicinity of T c originates from the microwave absorption in the grains, while the low temperature one is due to the absorption in the intergranular Josephson junctions [5,9]. The low temperature maximum is less pronounced in YNi 4 B samples than in YNi 4 BC 0.2 .…”

Methodology and search for superconductivity in the La–Si–C system

“…Conventional superconducting quantum interference device (SQUID) magnetometry is sensitive; however, it is tedious and slow, whereas transport measurements are only useful if a superconducting percolation path is present in the sample. On the other hand, magnetic field modulated microwave spectroscopy (MFMMS) [9][10][11] is very sensitive and allows detection of minuscule superconducting regions more quickly and more sensitively than conventional methods, which is particularly useful for highly inhomogeneous systems. Therefore, MFMMS provides the first screening step and allows large parts of the phase diagram which are not superconducting to be discarded.…”

Superconducting Properties of Mo2Re3Bx-Mo3Re2BxEutectic

“…The application of a second modulation of DC magnetic field with a frequency equal to 100 kHz caused that the recorded signal was an electronic derivative of microwave absorption. The details concerning the method and the experimental setup can be found elsewhere [9,10].…”