Microwave Measurements on YBaCuO Thin Films and Realisation of Microwave Superconducting Devices
نویسندگان
چکیده
Two characterisations methods in microwaves are presented. They permit to obtain IS*, Rs and h for a HTS film without the need of any theoretical model for the superconductivity. The best film tested exhibits at 35GHz and 78K a Rs value of LO&. at least three times lower than the copper one. A quasi-integrated oscillator has been realised on a lcm2 area: it oscillates at 12GHz and close to liquid nitrogen temperature. At lower temperatures an output power of +3&m and a phase noise of -100&cMz at JOOkHz from the carrier have been recorded.
منابع مشابه
MgB2 superconducting thin films with a transition temperature of 39 kelvin.
We fabricated high-quality c axis-oriented epitaxial MgB2 thin films using a pulsed laser deposition technique. The thin films grown on (1 i 0 2) Al2O3 substrates have a transition temperature of 39 kelvin. The critical current density in zero field is approximately 6 x 10(6) amperes per cubic centimeter at 5 kelvin and approximately 3 x 10(5) amperes per cubic centimeter at 35 kelvin, which su...
متن کاملIN SflU GROWTH OF SUPERCONDUCHNG YBaCuO USING REACTIVE ELECTRON-BEAM COEVAPORATJONt
Conditions required for in sirn growth of YBaCuO thin films by reactive electron-beam evaporation have been explored Three sources of activated oxygen (atomic oxygen from microwave discharge, a plasma generated by electron beams, and an ion beam ) were compared. The best results so far were obtained with atomic oxygen. Epitaxial films with high critics currents were grown -on SrTiO3 and <...
متن کاملThe superconducting gap of in situ MgB2 thin films by microwave surface impedance measurements
Precision measurements of the microwave surface resistance Rs of in situ MgB2 films directly reveal an exponential behavior of Rs at low temperature indicating a fully-gapped order parameter. The entire temperature dependence of Rs is well described by a Mattis–Bardeen formalism, but with a small gap ratio of D(0)/kTc50.72, corresponding to D(0)51.9 meV. © 2002 American Institute of Physics. @D...
متن کاملMagnetic penetration depth measurements of superconducting thin films by a microstrip resonator technique
The microstrip resonator technique is a convenient way to sensitively measure the temperature dependence of the magnetic penetration depth, n(T), in superconducting thin films. Because the method relies on measuring the resonant frequency of a microwave transmission line resonator, one can very precisely measure small changes in A( T). This technique can resolve changes in ,4 on the order of se...
متن کاملSuperfluid inhomogeneity and microwave absorption in a model for thin high-Tc superconducting films
We investigate the microwave absorption arising from inhomogeneity in the superfluid density of thin high-Tc superconducting films. Such inhomogeneities may arise from a wide variety of sources, including quenched random disorder and static charge density waves such as stripes. We show that both mechanisms will inevitably produce additional absorption at finite frequencies. We present simple mo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2017