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Journal Articles

Extremely large and anisotropic upper critical field and the ferromagnetic instability in UCoGe

Aoki, Dai*; Matsuda, Tatsuma; Taufour, V.*; Hassinger, E.*; Knebel, G.*; Flouquet, J.*

Journal of the Physical Society of Japan, 78(11), p.113709_1 - 113709_4, 2009/11

 Times Cited Count:119 Percentile:95.54(Physics, Multidisciplinary)

Magnetoresistivity measurements with fine tuning of the field direction on high quality single crystals of the ferromagnetic superconductor UCoGe show anomalous anisotropy of the upper critical field $$H_{rm c2}$$. $$H_{rm c2}$$ for $$H||b$$-axis ($$H_{rm c2}^b$$) in the orthorhombic crystal structure is strongly enhanced with decreasing temperature with an S-shape and reaches nearly 20 T at 0 K. The temperature dependence of $$H_{rm c2}^a$$ shows upward curvature with a low temperature value exceeding 30 T, while $$H_{rm c2}^c$$ at 0K is very small ($$sim$$0.6 T).Contrary to conventional ferromagnets, the decrease of the Curie temperature with increasing field for $$H||$$$$b$$-axis marked by an enhancement of the effective mass of the conduction electrons appears to be the origin of the S-shaped $$H_{rm c2}^b$$ curve. These results indicate that the field-induced ferromagnetic instability or magnetic quantum criticality reinforces superconductivity.

Journal Articles

A Three-dimensional neutronics-thermohydraulics simulation of core disruptive accident in sodium-cooled fast reactor

Yamano, Hidemasa; Tobita, Yoshiharu; Fujita, Satoshi

Nuclear Engineering and Design, 239(9), p.1673 - 1681, 2009/09

 Times Cited Count:11 Percentile:62.13(Nuclear Science & Technology)

The SIMMER-III code is a two-dimensional, multi-velocity-field, multi-phase, multi-component, Eulerian, fluid-dynamics code coupled with a fuel-pin model and a space- and energy-dependent neutron transport kinetics model. Since SIMMER-III is expected to become a standard tool for fast reactor safety analysis with likely application to licensing calculations, the code must be demonstrated to be sufficiently robust and reliable. For this purpose, a systematic assessment program of the code has been conducted in cooperation with European partners. The development of SIMMER-IV has been performed to be a direct extension of SIMMER-III to three dimensions. Recently, the parallelization of SIMMER-IV has been made to allow applications to reactor calculation within available computational resource. A three-dimensional calculation with SIMMER-IV is presented to indicate more realistic accident scenario.

Journal Articles

Magnetization dynamics in the normal and superconducting phases of UPd$$_2$$Al$$_3$$, 1; Surveys in reciprocal space using neutron inelastic scattering

Hiess, A.*; Bernhoeft, N.*; Metoki, Naoto; Lander, G.*; Roessli, B.*; Sato, Noriaki*; Aso, Naofumi*; Haga, Yoshinori; Koike, Yoshihiro*; Komatsubara, Takemi*; et al.

Journal of Physics; Condensed Matter, 18(27), p.R437 - R451, 2006/07

 Times Cited Count:31 Percentile:33.53(Physics, Condensed Matter)

This topical review presents results from neutron inelastic scattering experiments on single crystals of UPd$$_2$$Al$$_3$$. We present a detailed and complete characterization of the wave vector- and energy-dependent magnetization dynamics in UPd$$_2$$Al$$_3$$ as measured by neutron inelastic scattering primarily in the form of extensive surveys in energy-momentum space under a wide range of experimental conditions, and put our observations in context with data that has been published previously by two independent groups. This study yields unique insight into the low-temperature ground state, which exhibits a microscopic coexistence of antiferromagnetism and superconductivity, makingUPd$$_2$$Al$$_3$$ one of the most accessible heavy-fermion superconductors that can be fully characterized by neutron spectroscopy.

Oral presentation

Renewed polarized neutron options on the triple-axis spectrometer TAS-1 at JAEA

Takeda, Masayasu; Nakamura, Mitsutaka; Kakurai, Kazuhisa; Leli$`e$vre-Berna, E.*; Tasset, F.*; Regnault, L.-P.*

no journal, , 

no abstracts in English

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