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Fe and 
Co nuclear magnetic resonance studiesSakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Ueda, Hiroaki*; Tanioku, Yasuaki*; Michioka, Chishiro*; Yoshimura, Kazuyoshi*; Takao, Kenta*; Shimoda, Aiko*; et al.
Physical Review B, 98(6), p.064403_1 - 064403_10, 2018/08
Times Cited Count：11 Percentile：48.30(Materials Science, Multidisciplinary)To specify preferential occupation sites of Co substituents and to clarify charge and spin states of Co ions in (La, Co)-cosubstituted hexagonal magnetoplumbite-type (M-type) Sr ferrite, Fe and Co nuclear magnetic resonance (NMR) spectra are measured under zero and external magnetic fields using powdered and single crystalline specimens. To a considerable degree, the charge compensation between La
and Co
works in the equal (La, Co)-codoped case, where more than half of the Co ions are considered to be present in the minority spin 
sites at the center of the oxygen tetrahedra, with the 
= 3/2 state carrying a small orbital moment owing to spin-orbit interaction. The remaining small number of high-spin Co ( = 3/2, 
= 1) ions with unquenched orbital moments would be distributed to the other octahedral 
, 
, and 
sites.
Al
CKoyama, Takehide*; Ozaki, Yuzuru*; Ueda, Koichi*; Mito, Takeshi*; Kohara, Takao*; Waki, Takeshi*; Tabata, Yoshikazu*; Michioka, Chishiro*; Yoshimura, Kazuyoshi*; Suzuki, Michito; et al.
Journal of the Physical Society of Japan, 81(Suppl.B), p.SB008_1 - SB008_5, 2012/12
Times Cited Count：1 Percentile：10.74(Physics, Multidisciplinary)The normal state properties of a noncentrosymmetric superconductor MoAlC are studied by means of the nuclear magnetic resonance (NMR) experiment. The change of NMR line shape and the peak of the nuclear spin-echo decay rate at 
130 K indicate that the MoAlC exhibits the phase transition prior to the emergence of superconductivity. The reduction in the conduction electron density is inferred from the decrease in the nuclear spin-lattice relaxation rate. The nature of the newly found phase transition is discussed by considering the result of the first principle calculations, indicating a good nesting property of the Fermi surfaces.
AlCKoyama, Takehide*; Ozaki, Yuzuru*; Ueda, Koichi*; Mito, Takeshi*; Kohara, Takao*; Waki, Tsuyoshi*; Tabata, Yoshikazu*; Michioka, Chishiro*; Yoshimura, Kazuyoshi*; Suzuki, Michito; et al.
Physical Review B, 84(21), p.212501_1 - 212501_4, 2011/12
Times Cited Count：12 Percentile：46.87(Materials Science, Multidisciplinary)The results of 
Al nuclear magnetic resonance and specific-heat measurements of the noncentrosymmetric superconductor MoAlC are reported. The phase transition around 130 K is inferred from a distinct change in the NMR spectrum, a clear peak in the spin-echo decay rate, and an anomaly in the specific heat. Possibility of charge-density wave ordering around 130 K is discussed by calculating the Fermi surfaces in the normal states and considering the partial quenching of the Fermi surfaces with the decrease in 1/
below the superconducting transition temperature.
Takahashi, Yoshihiro*; Fugane, Masaru*; Imagawa, Ryo*; Owaki, Akihiro*; Hirao, Toshio; Onoda, Shinobu; Oshima, Takeshi
JAEA-Review 2008-055, JAEA Takasaki Annual Report 2007, P. 7, 2008/11
no abstracts in English
Kamiwaki, Tadayoshi; Owada, Akihiko; Takeda, Takeshi; Nakamura, Hideo
JAEA-Testing 2008-006, 77 Pages, 2008/07
JAEA-Testing-2008-006.pdf:6.32MB
Non-condensable gas for the pressurization of accumulator (ACC) tanks of emergency core cooling system may flow into the primary system during loss-of-coolant accidents (LOCAs) in a pressurized water reactor (PWR) after the ACC coolant injection is completed. Since the non-condensable gas may travel to and accumulates in steam generators (SGs) U-tubes, primary cooling and depressurization via SG secondary-side depressurization would become ineffective because of the degradation of condensation heat transfer in SG U-tubes. Since quantitative measurement of gas concentration is necessary to clarify the influences of non-condensable gas on the depressurization in ROSA/LSTF experiments that simulate PWR LOCAs and transients, an apparatus using a Zirconia oxygen sensor has been developed to directly measure the gas concentration in steam by introducing air as the non-condensable gas for the ACC pressurization. This apparatus is improved and applied to LSTF experiments where the gas concentration is measured directly in vessel upper head where gas may pass through with steam and in SG outlet plenum where gas accumulates. This report describes the improvement of the apparatus and the results of oxygen gas measurement characterization tests and the LSTF secondary-side depressurization experiments.
TiO
added with TiOHoshino, Tsuyoshi; Kobayashi, Takeshi*; Nashimoto, Makoto*; Kawamura, Hiroshi; Dokiya, Masayuki*; Terai, Takayuki*; Yamawaki, Michio*; Takahashi, Yoichi*
JAERI-Conf 2004-012, p.140 - 147, 2004/07
no abstracts in English
TiOHoshino, Tsuyoshi; Kobayashi, Takeshi*; Nashimoto, Makoto*; Kawamura, Hiroshi; Terai, Takayuki*; Yamawaki, Michio*; Takahashi, Yoichi*
Journal of the Ceramic Society of Japan, Supplement, Vol.112, No.1 (CD-ROM), p.S354 - S357, 2004/05
no abstracts in English
Murakami, Masao*; Demizu, Yusuke*; Niwa, Yasue*; Nagayama, Shinichi*; Maeda, Takuya*; Baba, Masashi*; Miyawaki, Daisuke*; Terashima, Kazuki*; Arimura, Takeshi*; Mima, Masayuki*; et al.
no journal, ,
Takahashi, Yoshihiro*; Owaki, Akihiro*; Takeyasu, Hidenori*; Hirao, Toshio; Onoda, Shinobu; Makino, Takahiro; Oshima, Takeshi
no journal, ,
no abstracts in English
Takahashi, Yoshihiro*; Fugane, Masaru*; Imagawa, Ryo*; Owaki, Akihiro*; Hirao, Toshio; Onoda, Shinobu; Oshima, Takeshi
no journal, ,
no abstracts in English
Takahashi, Yoshihiro*; Imagawa, Ryo*; Owaki, Akihiro*; Takeyasu, Hidenori*; Hirao, Toshio; Onoda, Shinobu; Makino, Takahiro; Oshima, Takeshi
no journal, ,
no abstracts in English
Fe, Co-NMR study in La-Co substituted M-type Sr ferriteSakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Shimoda, Aiko*; Waki, Takeshi*; Tabata, Yoshikazu*; Nakamura, Hiroyuki*
no journal, ,
We will discuss about the Co sites and the electronic states of Co ions in La-Co co-substituted SrFe
O
using the Fe and Co NMR results.
Co NMR study in La-Co substituted 
-type Sr FerriteSakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Shimoda, Aiko*; Waki, Takeshi*; Tabata, Yoshikazu*; Nakamura, Hiroyuki*
no journal, ,
Zero field NMR experiments have been done using powdered samples and single crystals of SrFeO and La-Co co-substituted Sr
La
Fe
Co
O. The single crystals were grown by the flux method. Co NMR signals have been observed in the lower frequency range of 50-100 MHz and in the higher frequency range of 300-400 MHz. Spectral intensity in the lower frequency range is stronger than that in the higher frequency range. We will discuss the spin and charge states of Co ions using the NMR results, some complementary experiments and theoretical considerations.
Sakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Shimoda, Aiko*; Waki, Takeshi*; Tabata, Yoshikazu*; Nakamura, Hiroyuki*
no journal, ,
Fe and Co NMR spectra have been observed for La-Co co-substituted M-type Ferrite. We will microscopically discuss about the Co sites in the co-substituted M-type Ferrite as well as spin and charge states of Co ions.
with molten LiCl-LiONakayoshi, Akira; Kitawaki, Shinichi; Sakamura, Yoshiharu*; Uruga, Kazuyoshi*; Tanaka, Takeshi*
no journal, ,
no abstracts in English
Fe NMR study in La-Co substituted M-type Sr ferriteSakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Shimoda, Aiko*; Waki, Takeshi*; Tabata, Yoshikazu*; Nakamura, Hiroyuki*
no journal, ,
Zero field NMR experiments on SrFeO and SrLaFeCoO have been performed. The substitued Co sites will be discussed based on the NMR spectra.
Tanaka, Tadao; Yamaguchi, Tetsuji; Iida, Yoshihisa; Kimura, Yuichiro; Taki, Hiroshi; Fujiwara, Takeshi; Ueda, Masato*; Mukai, Masayuki; Yamada, Fumika; Mizuno, Tsuyoshi; et al.
no journal, ,
no abstracts in English
Nonoue, Kazuki; Nakayama, Tamotsu; Iekura, Takeshi; Kadowaki, Haruhiko; Fujiwara, Wataru
no journal, ,
no abstracts in English
Toda, Keisuke; Ando, Koji; Kadowaki, Haruhiko; Tezuka, Masashi; Hatakeyama, Takumi; Iekura, Takeshi; Matsushima, Akira
no journal, ,
no abstracts in English
