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THE SPIN REORIENTATION AND THE MAGNETIC ANISOTROPY IN R₂Fe17-xMxCy (R=Er, Tm, M=Al, Ga)
K.Ohno,T.Urakabe,M.Agata,T.Saito,K.Shinagawa,T.Tsushima 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
In order to consider the change of the magnetic anisotropy energy by the Al or Ga substitution for Fe, spin reorientation temperature T_(SR) and Curie temperature Tc in R₂Fe_(17-x)Mx, (R=Er, Tm, M=Al, Ga) have been studied both experimentally and theoretically. As a result, T_(SR) and Tc for R₂Fe_(17-x)Al_x, shift toward higher temperature side with x (0≤x≤2.0). The ΔTc, the difference of the Tc's between Er₂Fe_(17-x)Al_x, and Tm₂Fe_(17-x)Al_x, is always about 10 K independent of Al-content. But in the case of Ga substitution, the ΔTc increases with Ga-content ; especially, the ΔTc for x=2.0 is 43 K. This value of the ΔTc is not explained by only the difference of the de Gennes fator G between Er³+ and Tm³+, but it is thought that the values of J_(ErFe) and J_(TmFe) themselves are not equal. (J_(AB): the exchange interaction between A and B.)
S. Kondo,T. Nakanish,T. Saito,H. Nakagawa,H. Asada,K. Takahashi 한국물리학회 2007 Current Applied Physics Vol.7 No.1
Photoluminescence of microcrystalline CsPbBr3 lms grown from the amorphous phase shows stimulated emission not only at cryo-3 single crystals, where no stimulated emis-sion occurs even at 4.2 K. This is the rst demonstration of room temperature stimulated emission from metal halide compounds.The stimulated emission is so strong that single-path-light-amplication stimulated emission across the lm thickness is observed atrelatively low threshold excitation intensities of. 50 kW cm. 2 at 77 K and . 100 kW cm. 2 at 295 K suggesting a large optical gain. Theattributable to giant oscillator strength eect characteristic of excitonic superradiance recently reported in this issue.
Search for theH-dibaryon resonance inC12(K−,K+ΛΛX)
Yoon, C. J.,Akikawa, H.,Aoki, K.,Fukao, Y.,Funahashi, H.,Hayata, M.,Imai, K.,Miwa, K.,Okada, H.,Saito, N.,Sato, H. D.,Shoji, K.,Takahashi, H.,Taketani, K.,Asai, J.,Kurosawa, M.,Ieiri, M.,Hayakawa, T. American Physical Society 2007 PHYSICAL REVIEW C - Vol.75 No.2
Sechman, A.,Shimada, K.,Saito, N.,Ieda, T.,Ono, T. Asian Australasian Association of Animal Productio 1996 Animal Bioscience Vol.9 No.1
The present study was conducted to investigate the role of thyroid hormones in the regulation of gene expression of calbindin-$D_{28k}$ (CaBP-D28K) in the chicken. By employing slot blot and RIA analyses, levels of CABP-D28K mRNA and CaBP-D28K protein in the intestine, kidney, cerebellum and liver were measured 6 and 12 h after i.m. injection of 1, 25-dihydroxyvitamin $D_3$ [1, 25 $(OH)_2D_3$; 250 ng/chick] and 3, 5, 3'-triiodothyronine ($T_3$; 500 ng/chick) in one-day-old chicks. The abundant messages of CaBP-D28K mRNA were detected in the intestine, kidney and cerebellum while there was little message in the liver. After 1, 25 $(OH)_2D_3$ treatment (6 + 12 hours), levels of CaBP-D28K mRNA increased in the intestine, but there was no change in the mRNA levels in the kidney and cerebellum. Although $T_3$ alone had no effect on CaBP-D28K mRNA levels, simultaneous administration of $T_3$ enhanced the 1, 25 $(OH)_2D_3$ effect of levels of CaBP-D28K mRNA in the intestine both 6 and 12 h post-treatment, and in the kidney 12 h post-treatment. At a protein level, co-treatment with 1, 25 $(OH)_2D_3$ and $T_3$ elicited a significant increase in CaBP-D28K expression in the intestine 12 h post-treatment, as compared to treatment with only 1, 25 $(OH)_2D_3$, whereas no differences were observed in the CaBP-D28K protein levels in the kidney and cerebellum. These results suggest that thyroid hormones may play a synergistic role with 1, 25 $(OH)_2D_3$ for CaBP-D28K gene expression in the intestine and kidney in chicks.
K. Saito,I. Souma,Y. Oka,A. Murayama 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
We study electron-spin relaxation induced by Mn spins and eects of LO-phonon scattering in CdMnTe quantum wells, where Mn contents of 3.6 and 5.0 at% are examined. By using pump-probe absorption a under magnetic eld, the time constant of the electron-spin relaxation e is deduced as a function of the magnetic eld. Values of e under magnetic elds are ve times dierent between both the Mn contents, while those at 0 T re ect the Mn content. The latter fact for the spin-relaxation times at 0 T shows that the electron-spin relaxation is induced by Mn spins via the s-d exchange interaction. However, the former signicant dierence in e suggests that the number of eective Mn spins involved in the electron-energy relaxation is greatly dierent in the spin-relaxation between the spin-splitting electron levels under dierent magnetic elds. The eects of LO-phonon scattering on the electron-spin relaxation are observed when the spin-splitting is close to the one-LO-phonon energy, indicating an eective path of the electron-spin relaxation involving both the LO phonon and the Mn spins. We study electron-spin relaxation induced by Mn spins and eects of LO-phonon scattering in CdMnTe quantum wells, where Mn contents of 3.6 and 5.0 at% are examined. By using pump-probe absorption a under magnetic eld, the time constant of the electron-spin relaxation e is deduced as a function of the magnetic eld. Values of e under magnetic elds are ve times dierent between both the Mn contents, while those at 0 T re ect the Mn content. The latter fact for the spin-relaxation times at 0 T shows that the electron-spin relaxation is induced by Mn spins via the s-d exchange interaction. However, the former signicant dierence in e suggests that the number of eective Mn spins involved in the electron-energy relaxation is greatly dierent in the spin-relaxation between the spin-splitting electron levels under dierent magnetic elds. The eects of LO-phonon scattering on the electron-spin relaxation are observed when the spin-splitting is close to the one-LO-phonon energy, indicating an eective path of the electron-spin relaxation involving both the LO phonon and the Mn spins.
Preparation of copper nanoparticles with an organic coating by a pulsed wire discharge method
K. Murai,Y. Watanabe,Y. Saito,T. Nakayama,H. Suematsu,W. Jiang,K. Yatsui,심광보,코이치니하라 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.2
In the pulsed wire discharge method, a coating technique to prepare metal nanoparticles covered with organic matter has been investigated. Copper nanoparticles covered with organic matter have been successfully prepared by evaporation of a copper wire in an oleic acid vapor/mist. The thickness of the coating layer was a few nanometres. The median diameter of the powder was 25 nm, and became 10 nm smaller than that without the coating because of the inhibition of particle growth by the formation of the coating. From phase identification by transmission electron microscopy and X-ray diffraction analysis, it was found that the copper nanoparticles have been passivated and have not been oxidized in over 2 months. In the pulsed wire discharge method, a coating technique to prepare metal nanoparticles covered with organic matter has been investigated. Copper nanoparticles covered with organic matter have been successfully prepared by evaporation of a copper wire in an oleic acid vapor/mist. The thickness of the coating layer was a few nanometres. The median diameter of the powder was 25 nm, and became 10 nm smaller than that without the coating because of the inhibition of particle growth by the formation of the coating. From phase identification by transmission electron microscopy and X-ray diffraction analysis, it was found that the copper nanoparticles have been passivated and have not been oxidized in over 2 months.
Astrophysically Important 26Si States Studied with the 28Si(4He,6He)26Si Reaction
Y. K. Kwon,이춘식,J. Y. Moon,J. H. Lee,J. Y. Kim,M. K. Cheoun,S. Kubono,H. Yamaguchi,J. J. He,A. Saito,Y. Wakabayashi,H. Fujikawa,G. Amadio,N. Iwasa,K. Inafuku,L. H. Khiem,M. Tanaka,Y. Fuchi,A. A. Chen,S 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
The emission of a 1.809-MeV γ-ray from the first excited state of 26Mg, followed by β-decay of 26Al in its ground state (denoted as 26Alg.s.), has been identied by several gamma-ray telescopes. To resolve the controversy over the possible sources of the observational 1.809-MeV γ-rays, one needs accurate knowledge of the production rate of 26Alg.s.. The 25Al(p,γ)26Si reaction is one of the most important astrophysical reactions to be investigated, but its rate is uncertain due to the lack of level information on 26Si above the proton threshold (Qpγ = 5.518 MeV). Illiadis et al. suggested that the 25Al(p,γ)26Si reaction should be dominated by a 3+ unnatural parity state at Ex = 5970 keV. Recent studies proposed several states as candidates for the 3+ states. However, the spin-parity assignments for these states are still uncertain. In the present work, we measured the 28Si(4He,6He)26Si reaction at 120 MeV to confirm the unnatural parity states just above the proton threshold. The measurement was performed with the high-resolution particle analyzer at the Center for Nuclear Study, University of Tokyo. We observed a total of 22 excited states in 26Si. The 7018-keV level, which was only observed by Bardayan et al. with the 28Si(p; t)26Si reaction, was confirmed in our measurement. Among the candidates of unnatural parity states at Ex = 5678, 5916, and 5945 keV, the 5918-keV state was only observed within the error of the excitation energy. A new state at Ex = 6101 keV was also identified.