Zobrazeno 1 - 10
of 231
pro vyhledávání: '"Lowndes, D."'
Autor:
Lowndes, D. L. D.
A Quantum Key Distribution system has been demonstrated with a focus on applicability of the technology to a consumer use model. The optical devices were split into a large, expensive "Quantum ATM" (the Bob terminal) and a small, cheap handheld secti
Externí odkaz:
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.684367
Autor:
Upton, M. H., Klie, R. F., Hill, J. P., Gog, T., Casa, D., Ku, W., Zhu, Y., Sfeir, M. Y., Misewich, J., Eres, G., Lowndes, D.
We investigate the physical parameters controlling the low energy screening in carbon nanotubes via electron energy loss spectroscopy and inelastic x-ray scattering. Two plasmon-like features are observed, one near 9 eV (the so-called pi plasmon) and
Externí odkaz:
http://arxiv.org/abs/cond-mat/0611151
Autor:
Christen, H. M., Rouleau, C. M., Ohkubo, I., Zhai, H. Y., Lee, H. N., Sathyamurthy, S., Lowndes, D. H.
A new method for continuous compositional-spread (CCS) thin-film fabrication based on pulsed-laser deposition (PLD) is introduced. This approach is based on a translation of the substrate heater and the synchronized firing of the excimer laser, with
Externí odkaz:
http://arxiv.org/abs/cond-mat/0306452
Autor:
Bugoslavsky, Y., Cowey, L., Tate, T. J., Perkins, G. K., Moore, J., Lockman, Z., Berenov, A., MacManus-Driscoll, J. L., Caplin, A. D., Cohen, L. F., Zhai, H Y, Christen, H M, Paranthaman, M P, Lowndes, D H, Jo, M H, Blamire, M G
We discuss pinning properties of MgB2 thin films grown by pulsed-laser deposition (PLD) and by electron-beam (EB) evaporation. Two mechanisms are identified that contribute most effectively to the pinning of vortices in randomly oriented films. The E
Externí odkaz:
http://arxiv.org/abs/cond-mat/0207080
Autor:
Zhukov, A. A., Purnell, A., Miyoshi, Y., Bugoslavsky, Y., Lockman, Z., Berenov, A., MacManus-Driscoll, J. L., Cohen, L. F., Zhai, H. Y., Christen, H. M., Paranthaman, M. P., Lowndes, D. H., Jo, M. H., Blamire, M. G., Hao, Ling, Gallop, J. C.
The microwave power, dc magnetic field, frequency and temperature dependence of the surface resistance of MgB2 films and powder samples were studied. Sample quality is relatively easy to identify by a number of characteristics, the most clear being t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0109397
Autor:
Kaindl, R. A., Carnahan, M. A., Orenstein, J., Chemla, D. S., Christen, H. M., Zhai, H., Paranthaman, M., Lowndes, D. H.
Publikováno v:
Phys. Rev. Lett. 88, 027003 (2002).
We report the first study of the optical conductivity of MgB2 covering the range of its superconducting energy gap. Terahertz time-domain spectroscopy is utilized to determine the complex, frequency-dependent conductivity of thin films. The imaginary
Externí odkaz:
http://arxiv.org/abs/cond-mat/0106342
The effect of water exposure on MgB2 is studied by submerging an 800 nm thick MgB2 film into deionized water at room temperature for 1 hour, 4 hours, 10 hours, and 15 hours, and by analyzing the resulting material using scanning electron microscopy a
Externí odkaz:
http://arxiv.org/abs/cond-mat/0104309
Autor:
Zhai, H. Y., Christen, H. M., Zhang, L., Paranthaman, M., Cantoni, C., Sales, B. C., Fleming, P. H., Christen, D. K., Lowndes, D. H.
The growth mechanisms of MgB2 films obtained by different methods on various substrates are compared via a detailed cross-sectional scanning electron microscopy (SEM) study. The analyzed films include (a) samples obtained by an ex-situ post-anneal at
Externí odkaz:
http://arxiv.org/abs/cond-mat/0103618
Autor:
Zhai, H. Y., Christen, H. M., Zhang, L., Cantoni, C., Paranthaman, M., Sales, B. C., Christen, D. K., Lowndes, D. H.
Superconducting magnesium diboride films with Tc0 ~ 24 K and sharp transition \~ 1 K were successfully prepared on silicon substrates by pulsed laser deposition from a stoichiometric MgB2 target. Contrary to previous reports, anneals at 630 degree an
Externí odkaz:
http://arxiv.org/abs/cond-mat/0103588
Autor:
Paranthaman, M., Cantoni, C., Zhai, H. Y., Christen, H. M., Aytug, T., Sathyamurthy, S., Specht, E. D., Thompson, J. R., Lowndes, D. H., Kerchner, H. R., Christen, D. K.
Superconducting MgB(2) films with Tc = 38.6 K were prepared using a precursor-deposition, ex-situ post-processing approach. Precursor films of boron, ~0.5 micrometer thick, were deposited onto Al(2)O(3) (102) substrates by e-beam evaporation; a post-
Externí odkaz:
http://arxiv.org/abs/cond-mat/0103569