منابع مشابه
Microwave surface resistance of pristine and neutron-irradiated MgB2 samples in magnetic field
We report on the microwave surface resistance of two polycrystalline Mg11B2 samples; one consists of pristine material, the other has been irradiated at very high neutron fluence. It has already been reported that in the strongly irradiated sample the two gaps merge into a single value. The mw surface resistance has been measured in the linear regime as a function of the temperature and the DC ...
متن کاملFluxon dynamics in Li-Al codoped MgB2 by microwave surface resistance measurements
The magnetic-field-induced variations of the microwave surface resistance, Rs, have been investigated in ceramic Mg1−x(LiAl)xB2, with x in the range 0.1 ÷ 0.4. The measurements have been performed on increasing and decreasing the DC magnetic field, H0, at fixed temperatures. At low temperatures, we have observed a magnetic hysteresis in the Rs(H0) curves in all the investigated samples. On incr...
متن کاملEnergy gap, penetration depth, and surface resistance of MgB2 thin films determined by microwave resonator measurements
We have measured the temperature dependence of the microwave surface impedance Zs5Rs1ivm0l of two c-axis oriented MgB2 films employing dielectric resonator techniques. The temperature dependence of the magnetic-field penetration depth l determined by a sapphire dielectric resonator at 17.9 GHz can be well fitted from 5 K close to Tc by the standard BCS integral expression assuming the reduced e...
متن کاملMicrowave properties of superconducting MgB2
Measurements of 10 GHz microwave surface resistance, Rs , of dense MgB2 wire and pellet are reported. Significant improvements are observed in the wire with reduction of porosity. The data lie substantially above the theoretical estimates for a pure Bardeen–Cooper–Schrieffer s-wave superconductor. However, the Rs ~20 K! of the wire is an order of magnitude lower than that of polycrystal YBa2Cu3...
متن کاملSuperconducting Microwave Cavity Made of Bulk MgB2
We report the successful manufacture and characterization of a microwave resonant cylindrical cavity made of bulk MgB2 superconductor (Tc ≈ 38.5 K), which has been produced by the Reactive Liquid Mg Infiltration technique. The quality factor of the cavity for the TE011 mode, resonating at 9.79 GHz, has been measured as a function of the temperature. At T = 4.2 K, the unloaded quality factor is ...
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ژورنال
عنوان ژورنال: Superconductor Science and Technology
سال: 2001
ISSN: 0953-2048,1361-6668
DOI: 10.1088/0953-2048/14/5/101