研究者詳細 - 小山　佳一

論文 - 小山　佳一

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Amitani H., Asakawa A., Ogiso K., Nakahara T., Ushikai M., Haruta I., Koyama K.I., Amitani M., Cheng K.c., Inui A. . The role of adiponectin multimers in anorexia nervosa . Nutrition29 ( 1 ) 203 - 206 2013年1月

記述言語：日本語出版者・発行元：Nutrition

Objective: Anorexia nervosa (AN) continues to be a refractory disease because of its unknown pathogenesis. The role of adiponectin in AN has not been clarified. Moreover, few reports have described the relations between adiponectin isoforms and AN in the physical and psychological states. Therefore, we measured plasma adiponectin and its isoforms levels in patients with AN to examine their roles in AN. Methods: Eighteen women participated in this study: nine patients with AN and nine age-matched healthy controls. We examined plasma adiponectin and its isoforms levels in all subjects and administered three types of psychological test to patients with AN: the Eating Disorders Inventory-2, the Maudsley Obsessional-Compulsive Inventory, and the Beck Depression Inventory-2. Results: We found that the percentage of high-molecular-weight (HMW) to total adiponectin (%HMW) was significantly low and the percentage of low-molecular-weight (LMW) to total adiponectin (%LMW) was significantly high in the AN group compared with the control group. The %HMW positively and the %LMW negatively correlated with body mass index in the entire study population. The %HMW was also positively correlated with psychological symptoms such as social insecurity or cleaning evaluated with the Eating Disorders Inventory-2 or the Maudsley Obsessional-Compulsive Inventory. Conclusions: Our study indicates that all adiponectin isoforms should be evaluated in patients with AN in addition to total adiponectin. The decreased %HMW and the increased %LMW that were correlated with the body mass index and some components of psychopathology in our patients may indicate a complex role of adiponectin isoforms in maintaining energy homeostasis and emotion during extreme malnourishment. © 2013 Elsevier Inc.

DOI： 10.1016/j.nut.2012.07.011

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K. Watanabe, Y. Mitsui, K. Koyama . Heat-treatment processing for MnBi in high magnetic fields . Advances in Science and Technology78 19 - 24 2013年査読

重田出, 桜庭裕弥, 木村尚次郎, 小山佳一, 渡辺和雄, 高梨弘穀, 廣井政彦 . 26aKF-1 ハーフメタル型ホイスラー合金/超伝導体接合の輸送特性 III(スピントロニクス(スピン流),領域3(磁性,磁気共鳴)) . 日本物理学会講演概要集68.2.3 ( 0 ) 399 2013年

Goto J., Kakimoto T., Fujii S., Koyama K. . Magnetic and electronic structures of cobalt or copper substituted mn . MATERIALS TRANSACTIONS54 ( 12 ) 2309 - 2312 2013年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本金属学会

First-principles total-energy calculations have been performed for the hypothetical case of x = 1 in Mn2-xXxSb (X = Co and Cu) for several magnetic states using the full-potential linearized augmented plane wave method based on the generalized gradient approximation. The calculated total energy indicates that the Co (Cu) atom prefers the site Mn(I) to the site Mn(II) (Mn(II) to Mn(I)). This result of Co is consistent with the available neutron diffraction experiment. For CoMnSb where Co occupies the site Mn(I) the change of lattice constants (a and c) and c/a from AF2 to F is in good agreement with experimental trends. Our results indicate that the optimization of the ratio c/a (lattice distortion) is crucial to determine the most stable magnetic state and that the optimization of the atomic positions of the sites Mn(II) and Sb is also crucial. © 2013 The Japan Society for Technology of Plasticity.

DOI： 10.2320/matertrans.m2013327

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西迫裕也, 大久保亮成, 春森浩平, 重田出, 梅津理恵, 伊藤昌和, 小山佳一, 貝沼亮介, 廣井政彦 . アンドレーエフ反射法によるハーフメタル型ホイスラー合金Co2MnSiのスピン分極率測定 . 鹿児島大学理学部紀要46 1 - 8 2013年

I. Shigeta, Y. Sakuraba, S. Kimura, K. Koyama, K. Watanabe, K. Takanashi, M. Hiroi . Transport and magnetic properties of fully-epitaxial superconducting NbN/half-metallic Heulser alloy Co2MnSi bilayer films . Transactions of the Magnetics Society of Japan37 ( 3-2 ) 222 - 226 2013年

Orihashi H., Hiroi M., Mitsui Y., Takahashi K., Watanabe K., Matsubayashi K., Uwatoko Y., Koyama K. . Magnetic and Structural Properties of Mn₁.₈Co₀.₂Sb under High Magnetic Fields . MATERIALS TRANSACTIONS54 ( 6 ) 969 - 973 2013年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本金属学会

Magnetization, electrical resistivity and X-ray diffraction measurements were carried out for Mn1.8Co0.2Sb with a tetragonal structure in 4.2 ≤ T ≤ 280K and in field B up to 16 T. For B = 0 T, anisotropic structural deformation occurred at Tt ∼ 140K for zero-field cooling (ZFC), accompanied by a first-order magnetic transition from the ferrimagnetic (FRI) to antiferromagnetic (AFM) phases. In this deformation, the lattice parameters a and c changed by δ a/a=+0.15% and by δ c/c = -0.44%, respectively. By applying magnetic fields of 5 T, Tt decreased to 60K with thermal hysteresis of 35 K. The two-phase coexistence of the AFM and residual FRI phases was observed even at 10K for field cooling of 5 T, while a single phase of AFM was confirmed for ZFC. At B = 16 T, the transition did not occurs. In addition, a field-induced structural deformation was observed, accompanied by the metamagnetic transition just below Tt. The obtained results are discussed from a viewpoint on entropy change for the transition. © 2013 The Japan Institute of Metals and Materials.

DOI： 10.2320/matertrans.m2012415

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重田出, 桜庭裕弥, 木村尚次郎, 小山佳一, 渡辺和雄, 高梨弘毅, 廣井政彦 . 27aXA-13 ハーフメタル型ホイスラー合金/超伝導体接合の輸送特性II(27aXA スピントロニクス(ナノ磁性体),領域3(磁性,磁気共鳴)) . 日本物理学会講演概要集68.1.3 ( 0 ) 537 2013年

Mitsui Y., Koyama K., Watanabe K. . Bi–Mn Binary Phase Diagram in High Magnetic Fields . MATERIALS TRANSACTIONS54 ( 2 ) 242 - 245 2013年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本金属学会

To examine magnetic field effects on the BiMn equilibrium phase, a high-magnetic fields differential thermal analysis (HF-DTA) was performed for fields up to 18 T and temperatures ranging from 300 to 753 K. For zero field, the peritectic temperatures Tp1 (BiMn1.08 + Bi-rich liquid → BiMn) and Tp2 (αMn + Bi-rich liquid → BiMn 1.08), and the eutectic temperature TE (the Bi-rich liquid → Bi solid + BiMn) were determined to be 632, 721 and 538 K, respectively. The BiMn phase diagram at 18 T was obtained, which showed that Tp1 increases with increasing magnetic fields at the rate of 2KT-1. Furthermore, the liquidus boundary temperature Tliq between BiMn1.08 + liquid and Bi-rich liquid was found to increase nonlinearly with increasing magnetic field. © 2013 The Japan Institute of Metals.

DOI： 10.2320/matertrans.m2012310

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J.A. Monroe, I. Karaman, B. Basaran, W. Ito, R.Y. Umetsu, R. Kainuma, K. Koyama, Y.I. Chumlyakov . Direct measurement of large reversible magnetic-field-induced strain in Ni-Co-Mn-In metamagnetic shape memory alloys . Acta Materialia60 ( 20 ) 6883 - 6891 2012年12月査読

Inomata T., Matsukawa M., Kimura D., Yamato Y., Kobayashi S., Suryanarayanan R., Nimori S., Koyama K., Takahashi K., Watanabe K., Kobayashi N. . Suppression of the low-temperature phase-separated state under pressure in (Eu <inf>1-x</inf>Gd <inf>x</inf>) <inf>0.6</inf>Sr <inf>0.4</inf>MnO <inf>3</inf> (x = 0, 0.1) . Journal of Magnetism and Magnetic Materials324 ( 22 ) 3863 - 3869 2012年11月査読

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Magnetism and Magnetic Materials

We have demonstrated the effect of pressure on the steplike metamagnetic transition and its associated magnetostriction in (Eu 1-xGd x) 0.6Sr 0.4MnO 3 (x=0 and 0.1). The critical field initiating the field induced ferromagnetic transition in both samples is lowered by the applied pressure. The further application of external pressure up to 1.2 GPa on the x=0 parent sample causes a spontaneous ferromagnetic transition with a second-order like character, leading to collapses of the steplike transition and its concomitant lattice striction. These findings indicate a crucial role of the low-temperature phase separated state characterized by a suppressed magnetization upon decreasing temperature. © 2012 Elsevier B.V.

DOI： 10.1016/j.jmmm.2012.06.036

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K. Koyama, Y. Mitsui, E.S. Choi, Y. Ikehara, E. Palm, and K. Watanabe . Controlled Equilibrium State of Ferromagnetic MnBi by High Magnetic Fields . Proceedings of the 22nd International Workshop on Rare-Earth Permanent Magnets and their Applications, (Nagasaki, 2012) 110 - 113 2012年9月

T. Inomata, M. Matsukawa, D. Kimura, Y. Yamato, S. Kobayashi, R. Suryanarayanan, S. Nimori, K. Koyama, K. Takahashi, K. Watanabe, N. Kobayashi . Suppression of the low-temperature phase-separated state under pressure in (Eu1-xGdx)0.6Sr0.4MnO3 (x= 0, 0.1) . J. Magn. Magn. Mater.324 3863 - 3869 2012年7月査読

折橋広樹、満永大輔、廣井政彦、三井好古、高橋弘紀、渡辺和雄、小山佳一 . 強磁場 X 線回折実験による Mn1.8Co0.2Sb の磁場中結晶評価 . 日本金属学会誌76 ( 4 ) 246 - 250 2012年4月査読

S. Ebisu, K. Koyama, T. Horikoshi, M. Kokita, S. Nagata . Extremely broad hysteresis in the magnetization process of α-Dy <inf>2</inf>S<inf>3</inf> single crystal induced by high field cooling . Journal of Physics: Conference Series400 ( PART 3 ) 2012年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Journal of Physics: Conference Series

α-Dy2S3 possesses orthorhombic crystal structure having two crystallograpically inequivalent Dy sites. Magnetization process of α-Dy2S3 single crystal after cooling in the high magnetic field of 18 T has been investigated. The magnetization under the field of 18 T along the α-axis on the cooling process from 150 K shows step-like rises at 70 and 40 K and reaches about 9 μB per one Dy3+ at 1.5 K. This value, which corresponds to 90 % of full saturation moment of Dy3+, is much larger than 6 μB obtained at the same conditions after cooling in no magnetic field (zero-field cooling; ZFC). After cooling to 1.5 K, the magnetization while decreasing field shows abrupt drops at 3.0 and 1.7 T, and then comes to 0 μB at 0 T. Subsequently, while increasing field, the magnetization demonstrates a similar curve to that obtained after ZFC without step-like rise below 13.1 T. At μ0H = 13.1 T, the magnetization rises suddenly and agrees with the curve for the decreasing process. This irreversible magnetization process yields extremely broad hysteresis having width of μ0ΔH = 11.4 T. Broader hysteresis and narrower one are also observed at 4.2 and 10 K, respectively.

DOI： 10.1088/1742-6596/400/3/032010

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折橋広樹, 満永大輔, 廣井政彦, 三井好古, 高橋弘紀, 渡辺和雄, 小山佳一 . 強磁場 X 線回折実験による Mn<sub>1.8</sub>Co<sub>0.2</sub>Sb の磁場中結晶評価 . 日本金属学会誌76 ( 4 ) 246 - 250 2012年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本金属学会

Measurements of magnetization, electrical resistivity and high field X-ray powder diffraction (XRD) were carried out for polycrystalline Mn 1.8Co 0.2Sb in magnetic fields up to 5 T in 4.2-300 K temperature range, in order to investigate the structural properties affected by magnetic fields. In a zero field, the compound shows the first-order magnetic transition from the ferrimagnetic (FRI) to antiferromagnetic (AFM) states at T t = 145 K with decreasing temperature. By applying magnetic fields of 5 T, T tdecreased to 60 K with thermal hysteresis of 35 K. From the XRD measurements, not only the AFM phase but also the residual FRI phase was confirmed even at 10 K in cooling process under 5 T. Results obtained indicate that the residual FRI phase is kinetically arrested. © 2012 The Japan Institute of Metals.

DOI： 10.2320/jinstmet.76.246

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Y. Mitsui,K. Koyama,K. Takahashi, and Kazuo Watanabe . Development of an x-ray diffraction camera used in magnetic fields up to 10 T . Rev. Sci. Instrum.82 125104(1) - 125104(6) 2011年12月査読

廣井政彦、小山佳一、伊藤昌和、重田出 . ヘリウム液化装置 . 鹿児島大学理学部紀要44 27 - 32 2011年12月

Ito M., Nagi Y., Kado N., Urakawa S., Ogawa T., Kondo A., Koyama K., Watanabe K., Kindo K. . Magnetic properties of spinel FeCr<inf>2</inf>S<inf>4</inf> in high magnetic field . Journal of Magnetism and Magnetic Materials323 ( 24 ) 3290 - 3293 2011年12月査読

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Magnetism and Magnetic Materials

We studied temperature and magnetic field dependence of magnetization, M(T) and M(B), on thiospinel FeCr2S4. We observed a step-like anomaly at TOO∼9K for M(T) attributed to an orbital order transition in magnetic field 0 <B≤7T. Furthermore, also for M(B), the step-like anomaly appears at Bc∼5.5T below TOO. This suggests an existence of a magnetic phase boundary at Bc in T<TOO. Because the anomaly at Bc of M(B) exists in the orbital ordered phase, the spin structure of FeCr2S4 in T<TOO is strongly coupled with the lattice of the system. © 2011 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jmmm.2011.07.041

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K. Oikawa, Y. Mitsui, K. Koyama, K. Anzai . Thermodynamic Assessment of the Bi-Mn System . MATERIALS TRANSACTIONS52 ( 11 ) 2032 - 2039 2011年11月査読

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