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Watanabe, Hiroshi*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Andreyev, A. N.; Hashimoto, Takashi*; Kondev, F. G.*; Lane, G. J.*; Litvinov, Yu. A.*; Liu, J. J.*; Miyatake, Hiroari*; et al.
Physics Letters B, 814, p.136088_1 - 136088_6, 2021/03
Times Cited Count:4 Percentile:54.40(Astronomy & Astrophysics)Morales, A. I.*; Orlandi, R.; 61 of others*
Physics Letters B, 781, p.706 - 712, 2018/06
Times Cited Count:21 Percentile:84.76(Astronomy & Astrophysics)Morales, A. I.*; Benzoni, G.*; Watanabe, H.*; Tsunoda, Yusuke*; Otsuka, T.*; Nishimura, Shunji*; Browne, F.*; Daido, R.*; Doornenbal, P.*; Fang, Y.*; et al.
Physics Letters B, 765, p.328 - 333, 2017/02
Times Cited Count:33 Percentile:92.03(Astronomy & Astrophysics)Lic, R.*; Mach, H.*; Fraile, L. M.*; Gargano, A.*; Borge, M. J. G.*; Mrginean, N.*; Sotty, C. O.*; Vedia, V.*; Andreyev, A. N.; Benzoni, G.*; et al.
Physical Review C, 93(4), p.044303_1 - 044303_7, 2016/04
Times Cited Count:6 Percentile:44.13(Physics, Nuclear)Morales, A. I.*; Benzoni, G.*; Watanabe, H.*; Nishimura, Shunji*; Browne, F.*; Daido, R.*; Doornenbal, P.*; Fang, Y.*; Lorusso, G.*; Patel, Z.*; et al.
Physical Review C, 93(3), p.034328_1 - 034328_14, 2016/03
Times Cited Count:25 Percentile:84.68(Physics, Nuclear)Benzoni, G.*; Morales, A. I.*; Watanabe, H.*; Nishimura, Shunji*; Coraggio, L.*; Itaco, N.*; Gargano, A.*; Browne, F.*; Daido, R.*; Doornenbal, P.*; et al.
Physics Letters B, 751, p.107 - 112, 2015/12
Times Cited Count:20 Percentile:77.61(Astronomy & Astrophysics)Bottoni, S.*; Leoni, S.*; Fornal, B.*; Raabe, R.*; Rusek, K.*; Benzoni, G.*; Bracco, A.*; Crespi, F. C. L.*; Morales, A. I.*; Bednarczyk, P.*; et al.
Physical Review C, 92(2), p.024322_1 - 024322_8, 2015/08
Times Cited Count:21 Percentile:79.00(Physics, Nuclear)Oishi, Kazuki; Heffner, R. H.; Ito, Takashi; Higemoto, Wataru; Morris, G. D.*; Bauer, E. D.*; Graf, M. J.*; Zhu, J.-X.*; Morales, L. A.*; Sarrao, J. L.*; et al.
Physica B; Condensed Matter, 403(5-9), p.1013 - 1014, 2008/04
Times Cited Count:0 Percentile:0.00(Physics, Condensed Matter)PuCoGa has attracted much interest because it is the first Pu-based superconductor, having an order of magnitude higher transition temperature K than the isostructural heavy fermion superconductor CeCoIn (K). The mechanism of the superconductivity in PuCoGa is still under investigation, though recent experiments and theory suggest a magnetic origin. A unique aspect of this compound is the self-irradiation damage because Pu (Pu, = 24,000 years) creates lattice defects which scatter electrons and, hence, break superconducting pairs. In order to elucidate the magnitude and temperature dependence of the magnetic penetration depth , we have performed SR measurements in the same PuCoGa single crystals after 25 and 400 days of aging. We found that decreased from 18.5K to 15K for the aged sample, yet a quasi-linear temperature dependence was found for the low-temperature in both the fresh and aged sample, consistent with -wave pairing symmetry. The magnitude of the muon spin relaxation rate in the aged sample, , where and are the superfluid density and the effective mass, respectively, is reduced by about 70% compared to fresh sample. This indicates that the scattering from self-irradiation induced defects is not in the limit of the conventional Abrikosov-Gor'kov pair-breaking theory, but rather in the limit of short coherence length (about 2nm in PuCoGa) superconductivity.
Oishi, Kazuki; Heffner, R. H.; Morris, G. D.*; Bauer, E. D.*; Graf, M. J.*; Zhu, J.-X.*; Morales, L. A.*; Sarrao, J. L.*; Fluss, M. J.*; MacLaughlin, D. E.*; et al.
Physical Review B, 76(6), p.064504_1 - 064504_10, 2007/08
Times Cited Count:13 Percentile:51.60(Materials Science, Multidisciplinary)Oishi, Kazuki; Heffner, R. H.; Morris, G. D.*; Fluss, M. J.*; Bauer, E. D.*; Morales, L. A.*; Sarrao, J. L.*; MacLaughlin, D. E.*; Shu, L.*; Ito, Takashi; et al.
Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.566 - 568, 2007/03
no abstracts in English
Heffner, R. H.; Bauer, E. D.*; Chung, B.*; Fluss, M. J.*; Higemoto, Wataru; Ito, Takashi; MacLaughlin, D. E.*; Morales, L. A.*; Morris, G. D.*; Oishi, Kazuki; et al.
Journal of the Physical Society of Japan, 75(Suppl.), p.14 - 19, 2006/08
no abstracts in English
Morris, G. D.*; Heffner, R. H.; Bauer, E. D.*; Morales, L. A.*; Sarrao, J. L.*; Fluss, M. J.*; MacLaughlin, D. E.*; Shu, L.*; Anderson, J. E.*
Physica B; Condensed Matter, 374-375, p.180 - 183, 2006/03
Times Cited Count:15 Percentile:56.14(Physics, Condensed Matter)Oishi, Kazuki; Heffner, R. H.; Higemoto, Wataru; Ito, Takashi; Morris, G. D.*; Bauer, E. D.*; Morales, L. A.*; Sarrao, J. L.*; Fluss, M. J.*; MacLaughlin, D. E.*; et al.
no journal, ,
The discovery of the first Pu-based superconductor PuCoGa ( = 18.5 K) demonstrates the rich and complex nature of Pu-based materials. The mechanism of the superconductivity in PuCoGa is still under investigation, though recent experiments and theory suggest a magnetic origin. For example, the electronic structure of this material was investigated theoretically, and spin-fluctuation mediated superconductivity was suggested. NMR results also suggest that the superconducting order parameter of this Pu-based superconductor has d-wave symmetry. We note that Pu is a radioactive nucleus (Pu, = 24000 years), thus PuCoGa suffers self-induced radiation damage. Previous SR results performed at 600 Oe in a 25-day old single crystalline sample show a linear temperature dependence for the muon spin relaxation rate (, : magnetic penetration depth) for 0.5, suggesting d-wave pairing symmetry. We have performed SR experimentes on the same sample after 400 days of aging in order to obtain more detailed information on the order parameter, i.e., T-dependence of at several magnetic fields, as well as the effects of aging. We found that Tc decreased from 18.5 K to 15 K for the 25-day and 400-day samples, respectively, yet the linear temperature dependence remains, consistent with a line of nodes (and suggesting d-wave pairing symmetry). These results indicate that the temperature dependence of does not depend on accumulated radiation damage over the span of time measured.