MICROWAVE SURFACE IMPEDANCE OF A NEARLY FERROELECTRIC SUPERCONDUCTOR
نویسندگان
چکیده
منابع مشابه
Low-temperature microwave surface impedance of the conventional organic superconductor kappa -(BEDT-TTF)2Cu(NCS)2.
We have performed measurements of the microwave surface impedance Zs = Rs + iXs of the organic superconductor 1\;-(BEDT-TTF)zCu(NCS)z down to T = 0.8 K. The reactance Xs, and therefore the penetration depth A, exhibits no temperature dependence for T «Te • This result is in full agreement with calculations of the BCS ground state and gives no indication of unconventional pairing. Furthermore, w...
متن کاملModulated microwave surface impedance of superconducting films
We present details of an experimental method to measure the field modulated surface resistance (dR,/dH) of superconducting films accurately, which enables both field and temperature sweep experiments and is particularly useful for low-field or near T, measurements. The complex surface impedance Z,(H,T) =R,(H,T) + iX,(H, T) can also be simultaneously measured. This technique utilizes specially b...
متن کاملIntrinsic single-domain switching in ferroelectric materials on a nearly ideal surface.
Ferroelectric domain nucleation and growth in multiferroic BiFeO(3) is studied on a single-domain level by using piezoresponse force spectroscopy. Variation of local electromechanical response with dc tip bias is used to determine the size of the domain formed below the conductive scanning probe tip. The domain parameters are calculated self-consistently from the decoupled Green function theory...
متن کاملNearly perfect fluidity in a high-temperature superconductor
Perfect fluids are characterized as having the smallest ratio of shear viscosity to entropy density, η/s, consistent with quantum uncertainty and causality. So far, nearly perfect fluids have only been observed in the quark-gluon plasma and in unitary atomic Fermi gases, exotic systems that are amongst the hottest and coldest objects in the known universe, respectively. We use angle resolved ph...
متن کاملA broadband method for the measurement of the surface impedance of thin films at microwave frequencies
We present a new technique to measure the complex surface impedance of the mixed state of superconducting thin films over the broad frequency range 45 MHz-20 GHz. The surface impedance is extracted from measurements of the complex reflection coefficient made on the film using a vector network analyzer. The technique takes advantage of a special geometry in which the self-fields from currents fl...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Progress In Electromagnetics Research
سال: 2007
ISSN: 1559-8985
DOI: 10.2528/pier07030502