We report on the fabrication and characterization of nanopatterned superconducting quantum interference devices (SQUIDs) based grain boundary Josephson junctions in epitaxially grown multilayer YBa2Cu3O7 (YBCO)/SiTrO3 (STO) thin films. Nanopatterning is performed by Ga+ focused ion beam milling. The evolution electric transport noise properties YBCO nanoSQUIDs over a time span more than one yea...

The planar oxygen isotope effect coefficient measured as a function of hole doping in the Prand La-doped YBa2Cu3O7 (YBCO) and the Ni-doped La1.85Sr0.15CuO4 (LSCO) superconductors quantitatively and qualitatively follows the form originally proposed by Kresin andWolf [Phys. Rev. B 49, 3652 (1994)], which was derived for polarons perpendicular to the superconducting planes. Interestingly, the inv...

Civale et al. have recently measured the irreversibility line of YBa2Cu307 „(YBCO)films in the magnetic field-temperature plane, B;„(T),as a function of film thickness. We are able to reproduce the observed shift of B;„(T) to lower temperatures as the film thickness is reduced within a model of Aux-linelattice melting without pinning. While pinning must be important, this suggests B;„(T) is at ...

This letter describes the scaling behavior and Josephson properties of improved YBCO/PBCO/ YBCO edge-type junctions. The critical current, normal-state resistance, and I& product scale with barrier thickness and junction area. The coherence length of the PBCO barrier is estimated to be between 5 and 8 nm. As unambiguous evidence of the Josephson behavior, the microwave response as a function of...

We report on the effect of oxygen disorder in the CuO chains on the superconducting properties of oxygen depleted YBa2Cu3Ox(YBCO). While moderate disorder, induced thermally, depresses the critical temperature as a result of a reduced carrier concentration, strong oxygen disorder and chain fragmentation induced by low energy ~80 keV! He irradiation suppresses the critical temperature beyond the...

Behavior of ρab(T ) and RH(T ) is presented for LSCO and YBCO single crystals in the lightly hole-doped antiferromagnetic region, with an emphasis on the RH(T ) data. In both systems, RH is virtually constant at moderate temperatures and tends to increase at low temperatures. Since essentially the same behavior of ρab(T ) and RH(T ) is observed in both LSCO and YBCO, we discuss that the in-plan...

We examine the application of Josephson radiation emitters to spectral calibration of single-photonresolving detectors. Josephson junctions are patterned in a YBCO film on a bicrystal sapphire substrate and are voltage controlled to generate radiation in the frequency range of 0.05–1 THz. The detector used in this work consists of a gate-defined quantum-dot photon-to-charge transducer coupled t...

A modified flux-coupling type superconducting fault current limiter (SFCL) is proposed here for suppressing currents. The SFCL consists of a coupling transformer, an yttrium barium copper oxide (YBCO) pancake coil, and controlled switch. By flexibly adjusting the switch's contact states based on system operational conditions, transformer's primary inductance as well YBCO coil's normal-state res...

The use of monolithic high temperature superconductors in multipole configurations is analyzed in this paper. The properties of monolithic high temperature superconductors have been well documented, and monolithic tubes, disks and rods of different cross section and sizes can presently be obtained from several commercial vendors. In this paper, design issues of quadrupole magnets using single c...