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Thermally-activated flux flow (TAFF) resistivity above the irreversibility field is reported for two different c-axis textured MgB_2 superconducting films. Transport measurements at different perpendicular magnetic fields 0 < B < 9 T and temperatures
Externí odkaz:
http://arxiv.org/abs/cond-mat/0406294
Autor:
Gurevich, A., Patnaik, S., Braccini, V., Kim, K. H., Mielke, C., Song, X., Cooley, L. D., Bu, S. D., Kim, D. M., Choi, J. H., Belenky, L. J., Giencke, J., Lee, M. K., Tian, W., Pan, X. Q., Siri, A., Hellstrom, E. E., Eom, C. B., Larbalestier, D. C.
We report a significant enhancement of the upper critical field $H_{c2}$ of different $MgB_2$ samples alloyed with nonmagnetic impurities. By studying films and bulk polycrystals with different resistivities $\rho$, we show a clear trend of $H_{c2}$
Externí odkaz:
http://arxiv.org/abs/cond-mat/0305474
Autor:
Heitmann, T. W., Bu, S. D., Kim, D. M., Choi, J. H., Giencke, J., Eom, C. B., Regan, K. A., Rogado, N., Hayward, M. A., He, T., Slusky, J. S., Khalifah, P., Haas, M., Cava, R. J., Larbalestier, D. C, Rzchowski, M. S.
We report scanning tunneling spectroscopy (STS) measurements of the gap properties of both ceramic MgB2 and c-axis oriented epitaxial MgB2 thin films. Both show a temperature dependent zero bias conductance peak and evidence for two superconducting g
Externí odkaz:
http://arxiv.org/abs/cond-mat/0212194
Autor:
Nadgorny, B., Osofsky, M. S., Singh, D. J., Woods, G. T., Soulen, Jr., R. J., Lee, M. K., Bu, S. D., Eom, C. B.
We have measured the transport spin-polarization of epitaxial thin films of the conductive ferromagnetic oxide, SrRuO3, using Point Contact Andreev Reflection Spectroscopy (PCAR). In spite of the fact that spin-up and spin-down electronic densities o
Externí odkaz:
http://arxiv.org/abs/cond-mat/0209178
Autor:
Kim, D. H., Yang, J. S., Lee, K. W., Bu, S. D., Noh, T. W., Oh, S. -J., Kim, Y. -W., Chung, J. -S., Tanaka, H., Lee, H. Y., Kawai, T.
Anatase Ti0.96Co0.04O2 films were grown epitaxially on SrTiO3 (001) substrates by using plused laser deposition with in-situ reflection high-energy electron diffraction. The oxygen partial pressure, PO2, during the growth was systematically varied. A
Externí odkaz:
http://arxiv.org/abs/cond-mat/0208055
Autor:
Bu, S. D., Kim, D. M., Choi, J. H., Giencke, J., Patnaik, S., Cooley, L., Hellstrom, E. E., Larbalestier, D. C., Eom, C. B., Lettieri, ; J., Schlom, D. G., Tian, ; W., Pan, X.
We report the growth and properties of epitaxial MgB2 thin films on (0001) Al2O3 substrates. The MgB2 thin films were prepared by depositing boron films via RF magnetron sputtering, followed by a post-deposition anneal at 850C in magnesium vapor. X-r
Externí odkaz:
http://arxiv.org/abs/cond-mat/0204004
Autor:
Patnaik, S., Cooley, L. D., Gurevich, A., Polyanskii, A. A., Jiang, J., Cai, X. Y., Squitieri, A. A., Naus, M. T., Lee, M. K., Choi, J. H., Belenky, L., Bu, S. D., Letteri, J., Song, X., Schlom, D. G., Babcock, S. E., Eom, C. B., Hellstrom, E. E., Larbalestier, D. C.
Publikováno v:
Supercond. Sci. Technol. 14 No 6 (June 2001) 315-319
An important predicted, but so far uncharacterized, property of the new superconductor MgB2 is electronic anisotropy arising from its layered crystal structure. Here we report on three c-axis oriented thin films, showing that the upper critical field
Externí odkaz:
http://arxiv.org/abs/cond-mat/0104562
Autor:
Eom, C. B., Lee, M. K., Choi, J. H., Belenky, L., Song, X., Cooley, L. D., Naus, M. T., Patnaik, S., Jiang, J., Rikel, M., Polyanskii, A., Gurevich, A., Cai, X. Y., Bu, S. D., Babcock, S. E., Hellstrom, E. E., Larbalestier, D. C., Rogado, N., Regan, K. A., Hayward, M. A., He, T., Slusky, J. S., Inumaru, K., Haas, M. K., Cava, R. J.
Publikováno v:
Nature 411 (2001) 558-560
The discovery of superconductivity at 39 K in magnesium diboride offers the possibility of a new class of low-cost, high-performance superconducting materials for magnets and electronic applications. With twice the critical temperature of Nb_3Sn and
Externí odkaz:
http://arxiv.org/abs/cond-mat/0103425
Autor:
Baek, S. H., Park, J., Kim, D. M., Aksyuk, V. A., Das, R. R., Bu, S. D., Felker, D. A., Lettieri, J., Vaithyanathan, V., Bharadwaja, S. S. N., Bassiri-Gharb, N., Chen, Y. B., Sun, H. P., Folkman, C. M., Jang, H. W., Kreft, D. J., Streiffer, S. K., Ramesh, R., Pan, X. Q., Trolier-McKinstry, S., Schlom, D. G., Rzchowski, M. S., Blick, R. H., Eom, C. B.
Publikováno v:
Science, 2011 Nov . 334(6058), 958-961.
Externí odkaz:
https://www.jstor.org/stable/41351741
