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CoSiYamauchi, Hiroki; Sari, D. P.*; Yasui, Yukio*; Sakakura, Terutoshi*; Kimura, Hiroyuki*; Nakao, Akiko*; Ohara, Takashi; Honda, Takashi*; Kodama, Katsuaki; Igawa, Naoki; et al.
Physical Review Research (Internet), 6(1), p.013144_1 - 013144_9, 2024/02
Komatsu, Yuya*; Shimizu, Ryota*; Sato, Ryuhei*; Wilde, M.*; Nishio, Kazunori*; Katase, Takayoshi*; Matsumura, Daiju; Saito, Hiroyuki*; Miyauchi, Masahiro*; Adelman, J. R.*; et al.
Chemistry of Materials, 34(8), p.3616 - 3623, 2022/04
Times Cited Count：17 Percentile：76.57(Chemistry, Physical)Deng, Z.*; Jin, C. Q.*; Liu, Q. Q.*; Wang, X. C.*; Zhu, J. L.*; Feng, S. M.*; Chen, L. C.*; Yu, R. C.*; Arguello, C.*; Goko, Tatsuo*; et al.
Nature Communications (Internet), 2, p.1425_1 - 1425_5, 2011/08
Times Cited Count：169 Percentile：93.60(Multidisciplinary Sciences)In a prototypical ferromagnet (Ga,Mn)As based on a III-V semiconductor, substitution of divalent Mn atoms into trivalent Ga sites leads to severely limited chemical solubility and metastable specimens available only as thin films. The doping of hole carriers via (Ga,Mn) substitution also prohibits electron doping. To overcome these difficulties, Masek et al. theoretically proposed systems based on a I-II-V semiconductor LiZnAs, where isovalent (Zn,Mn) substitution is decoupled from carrier doping with excess/deficient Li concentrations. Here we show successful synthesis of Li
(Zn
Mn
)As in bulk materials. We reported that ferromagnetism with a critical temperature of up to 50 K is observed in nominally Li-excess compounds, which have p-type carriers.
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：0.00(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.
SR study of the effects of Ce dilution on the development of the heavy-fermion state in (Ce,La)
IrIn
Oishi, Kazuki; Heffner, R. H.; Ito, Takashi; Higemoto, Wataru; Morris, G. D.*; Hur, N.*; Bauer, E. D.*; Sarrao, J. L.*; Thompson, J. D.*; MacLaughlin, D. E.*; et al.
Journal of Physics and Chemistry of Solids, 68(11), p.2068 - 2071, 2007/11
Times Cited Count：2 Percentile：12.71(Chemistry, Multidisciplinary)no abstracts in English
-Pu metal using muon spin relaxationHeffner, R. H.; Oishi, Kazuki; Fluss, M. J.*; Morris, G. D.*; MacLaughlin, D. E.*; Shu, L.*; Chung, B. W.*; McCall, S. K.*; Bauer, E. D.*; Sarrao, J. L.*; et al.
Journal of Alloys and Compounds, 444-445, p.80 - 83, 2007/10
Times Cited Count：9 Percentile：50.27(Chemistry, Physical)We summarize the results of muon spin relaxation (SR) measurements carried out in
- and -Pu and in the superconducting state ofPuCoGa. In Pu metal, interest has centered on whether or not magnetic order exists in the hightemperature fcc phase,The Pu metal studies were designed to search for evidence of magnetic ordering, andhave set the most stringent limits to date for the ordered moment. In PuCoGa the temperature dependence of themagnetic penetration depth (T) was investigated in a fresh sample and again in the same sampleafter 400 days of aging. We find (T)
T for T 
Tc/2, indicating a line of nodes in thesuperconducting order parameter. Remarkably, the temperature dependence of (T) is littlechanged even after significant radiation damage.
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：50.65(Materials Science, Multidisciplinary) probed by muon spin rotationOishi, 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
SR studies of Pu metal and the Pu-based superconductor PuCoGaHeffner, 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
TiO
MacLaughlin, D. E.*; Rose, M. S.*; Anderson, J. E.*; Shu, L.*; Heffner, R. H.; Kimura, Tsuyoshi*; Morris, G. D.*; Bernal, O. O.*
Physica B; Condensed Matter, 374-375, p.142 - 144, 2006/03
Times Cited Count：3 Percentile：17.17(Physics, Condensed Matter)Longitudinal-field muon spin relaxation experiments have been carried out in the paramagnetic state of single-crystal GdTiO just above the phase transition. At high applied fields the relaxation time is proportional to field. At low fields the relaxation rate increases markedly as the freezing temperature is approached. This behavior is consistent with the very long autocorrelation function cutoff time.
-Pu and Ga-stabilized -PuHeffner, R. H.; Morris, G. D.*; Fluss, M. J.*; Chung, B.*; MacLaughlin, D. E.*; Shu, L.*; Anderson, J. E.*
Physica B; Condensed Matter, 374-375, p.163 - 166, 2006/03
Times Cited Count：8 Percentile：37.38(Physics, Condensed Matter)The SR measurements in pulutonium metals are reported for the first time. The ground-state properties of Pu metal is not understood clearly. We found the upper limits of the ordered moment in -Pu and -stabilized Pu is 
at 
4K.
IrInHeffner, R. H.; Morris, G. D.*; Bauer, E. D.*; Sarrao, J. L.*; Thompson, J. D.*; MacLaughlin, D. E.*; Shu, L.*
Physica B; Condensed Matter, 375-375, p.184 - 187, 2006/03
Times Cited Count：6 Percentile：30.26(Physics, Condensed Matter)SR studies of the superconducting order parameter in PuCoGaMorris, 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：55.13(Physics, Condensed Matter)Heffner, R. H.; Morris, G. D.*; Fluss, M. J.*; Chung, B.*; McCall, S.*; MacLaughlin, D. E.*; Shu, L.*; Oishi, Kazuki; Bauer, E. D.*; Sarrao, J. L.*; et al.
Physical Review B, 73(9), p.094453_1 - 094453_5, 2006/03
Times Cited Count：35 Percentile：77.61(Materials Science, Multidisciplinary)no abstracts in English
La
RhInMacLaughlin, D. E.*; Shu, L.*; Anderson, J. E.*; Heffner, R. H.; Morris, G. D.*; Bernal, O. O.*; Kim, J. S.*; Stewart, G. R.*
Physica B; Condensed Matter, 378-380, p.144 - 145, 2006/02
Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)
Sb
Shu, L.*; MacLaughlin, D. E.*; Heffner, R. H.; Callaghan, F. D.*; Sonier, J. E.*; Morris, G. D.*; Bernal, O. O.*; Bosse, A.*; Anderson, J. E.*; Yuhasz, W. M.*; et al.
Physica B; Condensed Matter, 374-375, p.247 - 250, 2006/01
Times Cited Count：6 Percentile：30.26(Physics, Condensed Matter)Irie, Yoshiro; Dooling, J.*; Horan, D.*; Kustom, R.*; Middendorf, M.*; Pile, G.*; Bayley, D.*; Cross, G.*; Gardner, I.*; Glover, M.*; et al.
Proceedings of 10th European Particle Accelerator Conference (EPAC 2006) (CD-ROM), p.321 - 323, 2006/00
Wideband low-output-impedance RF system for the second harmonic cavity in the ISIS synchrotron has been developed by the collaboration between ANL (US), KEK (Japan) and RAL (UK). Low output impedance is realized by the feedback from plate to grid of the final triode amplifier, resulting in less than 30 ohms over a wide frequency range of 2.7 - 6.2 MHz. The vacuum tubes in the driver and final stages are both operated in class A. High power test was performed with a ferrite-loaded second harmonic cavity, where the bias current was swept at 50 Hz repetition rate. The maximum voltage of 12 kV peak per accelerating gap was obtained stably at earlier period of an acceleration cycle. A beam test with this system is planned at the ISIS synchrotron soon.
IrInOishi, Kazuki; Heffner, R. H.; Ito, Takashi; Higemoto, Wataru; Morris, G. D.*; Bauer, E. D.*; Sarrao, J. L.*; Thompson, J. D.*; MacLaughlin, D. E.*; Shu, L.*
no journal, ,
no abstracts in English
SR measurements on the superconducting penetration depth in aged PuCoGaHeffner, R. H.; Oishi, Kazuki; Higemoto, Wataru; Ito, Takashi; Morris, G. D.*; Fluss, M. J.*; MacLaughlin, D. E.*; Shu, L.*; Bauer, E. D.*; Sarrao, J. L.*
no journal, ,
The superconductor PuCoGa
possesses a relatively high critical temperature (T
= 18.5 K), a moderate mass enhancement (Sommerfeld coefficient 
80 mJ/mol-K
and exhibits behavior consistent with spin-fluctuation-induced d-wave superconductivity. It is also radioactive, with its dominant radioisotope Pu having a half-life of 2.4 
10
yrs. We report 
SR measurements of the temperature and field dependence of the magnetic field penetration depth 
(T,H) in a 400 day-old sample of PuCoGa (T = 15 K), and compare these results to data obtained on the same sample approximately one year earlier. In 600 Oe applied field both measurements show a linear low-temperature behavior for (T) - (0) = bT for T/T
0.5 with the same coefficient b. The magnitude of (0) in the aged sample has increased by a factor of about 1.8. The results are discussed in terms of the effects of radiation damage on the postulated d-wave superconducting order parameter.
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
