Zobrazeno 1 - 10
of 248
pro vyhledávání: '"CERESARA S."'
Highly dense MgB2 policrystalline bulk materials, obtained by reactive liquid infiltration, have been characterized in their superconducting transport and magnetic properties in magnetic field and in a temperature range of interest for the MgB2 compo
Externí odkaz:
http://arxiv.org/abs/cond-mat/0208043
Autor:
Giunchi, G., Ceresara, S., Ripamonti, G., DiZenobio, A., Rossi, S., Chiarelli, S., Spadoni, M., Wesche, R., Bruzzone, P. L.
MgB2 hollow wires have been produced with a new technique which uses a conventional wire manufacturing process but is applied to composite billets containing the elemental B and Mg precursors in an appropriate shape. The technique has been applied to
Externí odkaz:
http://arxiv.org/abs/cond-mat/0207488
Autor:
Andreone, A., Ausanio, G., Di Gennaro, E., Lamura, G., Salluzzo, M., Cochec, J. Le, Gauzzi, A., Cantoni, C., Paranthaman, M., Giunchi, G., Ceresara, S.
We present a study of the electrodynamic response of MgB2 pellets and thin film samples exhibiting critical temperatures ranging between 26 and 38 K. We have performed accurate measurements of the surface impedance ZS =RS+iXS as a function of the tem
Externí odkaz:
http://arxiv.org/abs/cond-mat/0110640
Autor:
Gonnelli, R. S., Calzolari, A., Daghero, D., Ummarino, G. A., Stepanov, V. A., Fino, P., Giunchi, G., Ceresara, S., Ripamonti, G.
Publikováno v:
J. Phys. Chem. Solids 63, 2319 (2002)
We studied the voltage and temperature dependency of the dynamic conductance of normal metal-MgB2 junctions obtained either with the point-contact technique (with Au and Pt tips) or by making Ag-paint spots on the surface of high-quality single-cryst
Externí odkaz:
http://arxiv.org/abs/cond-mat/0107239
Autor:
Gonnelli, R. S., Calzolari, A., Daghero, D., Ummarino, G. A., Stepanov, V. A., Giunchi, G., Ceresara, S., Ripamonti, G.
Publikováno v:
Phys. Rev. Lett. 87, 097001 (2001)
We present the first observation of the DC and AC Josephson effect in MgB_2 break junctions. The junctions, obtained at 4.2 K in high-quality, high-density polycrystalline metallic MgB_2 samples, show a non-hysteretic DC Josephson effect. By irradiat
Externí odkaz:
http://arxiv.org/abs/cond-mat/0105241
Publikováno v:
Phys. Rev. B 64, 132503 (2001)
We measured the complex dynamic elastic modulus of MgB2 between 1.3 and 650 K at frequencies included between 5 and 70 kHz. The main purpose of this work is to search for possible lattice instabilities, which could contribute to enhance the electron-
Externí odkaz:
http://arxiv.org/abs/cond-mat/0105157
Autor:
Gozzelino, L., Laviano, F., Botta, D., Chiodoni, A., Gerbaldo, R., Ghigo, G., Mezzetti, E., Giunchi, G., Ceresara, S., Ripamonti, G., Poyer, M.
An extended magneto-optical (MO) analysis of samples cut from high-density pellets of MgB2 is reported. For sake of comparison some magnetic measurements and critical values are also shown. Notwithstanding the fact that the optical and SEM images exh
Externí odkaz:
http://arxiv.org/abs/cond-mat/0104069
Publikováno v:
In Physica C: Superconductivity and its applications 2003 386:394-397
Autor:
Gonnelli, R.S. ∗, Calzolari, A., Daghero, D., Ummarino, G.A., Stepanov, V.A., Fino, P., Giunchi, G., Ceresara, S., Ripamonti, G.
Publikováno v:
In Journal of Physics and Chemistry of Solids 2002 63(12):2319-2323
Publikováno v:
In Physica C: Superconductivity and its applications 1999 312(3):202-212