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Bauer, E. D.*; Yang, Y.-F.*; Capan, C.*; Urbano, R. R.*; Miclea, C. F.*; Sakai, Hironori; Ronning, F.*; Graf, M. J.*; Balatsky, A. V.*; Movshovich, R.*; et al.
Proceedings of the National Academy of Sciences of the United States of America, 108(17), p.6857 - 6861, 2011/04
Times Cited Count：36 Percentile：81.82(Multidisciplinary Sciences)Here, we report a manifestation of electronic inhomogeneity in a strongly correlated 
-electron system, using CeCoIn
as an example. A thermodynamic analysis of its superconductivity, combined with nuclear quadrupole resonance measurements, shows that nonmagnetic impurities (Y, La, Yb, Th, Hg, and Sn) locally suppress unconventional superconductivity, generating an inhomogeneous electronic "Swiss cheese" due to disrupted periodicity of the Kondo lattice. Our analysis may be generalized to include related systems, suggesting that electronic inhomogeneity should be considered broadly in Kondo lattice materials.
probed by muon spin rotationOishi, 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(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：51.77(Materials Science, Multidisciplinary)Heffner, R. H.; Oishi, Kazuki; Higemoto, Wataru; Ito, Takashi; Morris, G. D.*; Bauer, E. D.*; Graf, M. J.*; Sarrao, J. L.*; Fluss, M. J.*; MacLaughlin, D. E.*; et al.
no journal, ,
no abstracts in English
