Details of a Researcher - Kamihara, Yoichi

Presentations -

Division display 101 - 120 of about 341 ／ All the affair displays >>

Crystallographic phases in Y0.77Gd0.23Ba2Cu3O7-δ thin film annealed in the range of 573 K to 673 K

S. Kozutsumi, S. Iwasaki, M. Matoba, Y. Kamihara, M. Miura

The 6th Japan-Korea International Seminar on Materials Science and Engineering (JKMST2019) (Sapporo, Japan) ,

2019.08

Poster presentation, The Materials Science Society of Japan, Materials Research Society of Korea

In this study, we demonstrate a Temperature (T)-Pressure (P) phase diagram for (Y,Gd)BCO thin film annealed at T = 573 K-673 K. The T-P phase diagram is an essential information to elucidate possible approach to demonstrate such an anion-doped (Y,Gd)BCO thin films. As-grown (Y,Gd)BCO thin films were made by metal organic depositions and processed on the best annealing condition for obtaining the highest transition temperature, 92.5 K. Crystallographic phase of annealed (Y,Gd)BCO thin films were checked by X-ray diffraction (XRD) (Rigaku, RINT2500Ultra18). XRD patterns of (Y,Gd)BCO are shown in the figure. The orthorhombic crystallographic phase of (Y,Gd)BCO thin films appears in a sample annealed at 673 K.

Thermal transport properties of mixed anion layered compound Sr2CrFeAsO3-delta,

H. Karimata, M. Yamaguchi, S. Iwasaki, R. Sakagami, Y. Goto, Y. Mizuguchi, M. Matoba, Y. Kamihara

The 6th Japan-Korea International Seminar on Materials Science and Engineering (JKMST2019) (Sapporo, Japan) ,

2019.08

Poster presentation, The Materials Science Society of Japan, Materials Research Society of Korea

Sr2CrFeAsO3-δ consists of a carrier conducting FeAs layer and carrier blocking Sr2CrO3-δ layer. Polycrystalline Sr2CrFeAsO3-δ samples were prepared by a solid-state reaction. And hot-pressed (HP) Sr2CrFeAsO3-δ (δ=0.250) were prepared from polycrystalline Sr2CrFeAsO3-δ. The amounts of oxygen deficiency (δ) for the polycrystalline and HP samples were determined assuming a linear relation between δ and lattice volume (V). The c axis of HP Sr2CrFeAsO3-δ sample is slightly oriented along the pressure direction. Transport properties of HP Sr2CrFeAsO3-δ were measured at temperature (T) = 300?673 K. HP Sr2CrFeAsO3-δ exhibits a maximum electrical resistivity (ρ) 58 mΩ cm at 473 K. HP Sr2CrFeAsO3-δ also exhibits a minimum thermal conductivity (κ) 3.5 W m?1 K?1 at 300 K.

Spontaneous magnetic polarization of a layered hexagonal compound, EuSn2As2

K. Hirata, R. Sakagami, M. Matoba, Y. Kamihara

The 6th Japan-Korea International Seminar on Materials Science and Engineering (JKMST2019) (Sapporo, Japan) ,

2019.08

Poster presentation, The Materials Science Society of Japan, Materials Research Society of Korea

EuSn2As2 is magnetic material that was reported by Arguilla et al in 2017. The crystal structure of
EuSn2As2 is classified in hexagonal lattice, and the space group is R3-m. In EuSn2As2, a layer of Eu2+
and two [Sn2As2]2- layers are alternately stacked by van der Waals attractoin force. In 2019, EuSn2P2
whose crystallographic structures are identical to EuSn2As2, was reported by Gui et al. Such kinds
of crystallographic structures have been focused as candidates for thermoelectric materials from
1954. At present, these are studied again as a candidate substance for which topological transport
phenomena may be observed. In this symposium, we demonstrate magnetization (M) as a function of
magnetic field (H), Arrott plot, and temperature (T) dependence of spontaneous magnetic polarization
(Ms) for polycrystalline EuSn2As2.

Several possible electronic phases in FeS and SrTiO3 interface based on density functional theory

K. Watanabe, S. Higashi, M. Nakanishi, M. Matoba, Y. Kamihara

The 6th Japan-Korea International Seminar on Materials Science and Engineering (JKMST2019) (Sapporo, Japan) ,

2019.08

Poster presentation, The Materials Science Society of Japan, Materials Research Society of Korea

層状オキシカルコゲナイドLaCuChO (Ch = S, Se, Te)の熱伝導率に対する非調和格子動力学による理論検証

北脇樹，中西愛，神原陽一

日本材料科学会主催 2019年度学術講演大会 (関東学院大学KGU関内メディアセンター8階（神奈川県横浜市中区太田町2-23）) ,

2019.05

Oral presentation (general), 日本材料科学会

密度汎関数理論による酸素発生触媒CaCu3Fe4O12の水分子吸着能評価

河嶋丈富，中西愛，渡邉健太郎, 神原陽一，的場正憲

日本材料科学会主催 2019年度学術講演大会 (関東学院大学KGU関内メディアセンター8階（神奈川県横浜市中区太田町2-23）) ,

2019.05

Oral presentation (general), 日本材料科学会

酸素欠損を持つCaTiO3の密度汎関数理論による熱力学的安定性評価

青木佑介，中西愛，渡邉健太郎，神原陽一

日本材料科学会主催 2019年度学術講演大会 (関東学院大学KGU関内メディアセンター8階（神奈川県横浜市中区太田町2-23）) ,

2019.05

Oral presentation (general), 日本材料科学会

低温で熱処理された銅酸化物超伝導体Y0.77Gd0.23Ba2Cu3O7-δ薄膜の結晶相評価

小堤渉平，岩崎秀，的場正憲，神原陽一，三浦正志

日本材料科学会主催 2019年度学術講演大会 (関東学院大学KGU関内メディアセンター8階（神奈川県横浜市中区太田町2-23）) ,

2019.05

Poster presentation, 日本材料科学会

Observation of magnetically combined two-dimensional electronic states in a bulk layered antiferromagnet EuSn2As2

S. Sakuragi, R. Sakagami, K. Kuroda, C. Bareille, N. Azuma, T. Iwatake, S. Sasaki, S. Doi, N. Tsujimoto, R. Akashi, S. Kunisada, R. Noguchi, K. Kurokawa, T. K. Kim, C. Cacho, S. Shin, Y. Kamihara, and T. Kondo

日本物理学会第74回年次大会（2019年） (〒819-0395 福岡市西区元岡744 九州大学伊都キャンパス) ,

2019.03

Oral presentation (general)

近年、新奇機能性材料の創出の観点から、機能性二次元材料をファンデルワールス力により積層した層状物質が注目を集めている。これらの物質系では、層間の電気的、光学的、またスピン軌道結合を自在に設計し、制御することが可能になると期待される。このような観点から、我々は二次元(層内)強磁性Eu 層により二枚のSnAs 層が挟まれたEuSn2As2に関して研究を行った。

熱電物質LaOBiS2-xSexにおける電子・局所結晶構造の分光測定

寺嶋健成, 矢野佑幸, Paris Eugenio, 後藤陽介, 水口佳一, 神原陽一, 脇田高徳, 村岡祐治, Saini Naurang L., 横谷尚睦

日本物理学会第74回年次大会（2019年） (〒819-0395 福岡市西区元岡744 九州大学伊都キャンパス) ,

2019.03

Oral presentation (general)

Magnetic and structural properties of superconducting mixed anion layered compound, La(Ca)FeAsO(F)

K. Kaneyasu, M. Matoba, Y. Kamihara

The 5th Korea-Japan International Seminar on Materials Science and Engineering (KJMST2018), A Joint seminar with 2018 Fall conference of the Materials Research Society of Korea (Yeosu, Korea) ,

2018.11

Poster presentation, K-MRS, MSSJ

Magnetic properties of perovskite-related mixed anion layered compounds, Sr2TMFeAsO3-delta, (TM: Cr, V)

KAMIHARA Yoichi

The 5th Korea-Japan International Seminar on Materials Science and Engineering (KJMST2018), A Joint seminar with 2018 Fall conference of the Materials Research Society of Korea (Yeosu, Korea) ,

2018.11

Oral presentation (invited, special), K-MRS, MSSJ

Electrical structure and thermal properties of ZrCuSiAs type mixed anion layered compounds

M. Nakanishi, M. Matoba, Y. Kamihara

The 5th Korea-Japan International Seminar on Materials Science and Engineering (KJMST2018), A Joint seminar with 2018 Fall conference of the Materials Research Society of Korea (Yeosu, Korea) ,

2018.11

Poster presentation, K-MRS, MSSJ

熱電変換材料の性能は無次元性能指数ZT=S2σT/κ、すなわちゼーベック係数(S)、電気伝導率(σ)、絶対温度(T)、熱伝導率(κ)より定義される。ZTが1を超えると実用的な熱電材料といえる。混合アニオン層状化合物の1111系BiCuSeOは1付近のZTを示すことが知られている。われわれは1111系AeMnPnF (Ae: アルカリ土類)の熱電変換性能を非経験的計算により部分的に予想した。

Transport properties of the layered hexagonal compound, EuSn2As2

R. Sakagami, H. Karimata, N. Azuma, M. Yamaguchi, S. Iwasaki, Y. Goto, Y. Mizuguchi, M. Matoba, Y. Kamihara

The 5th Korea-Japan International Seminar on Materials Science and Engineering (KJMST2018), A Joint seminar with 2018 Fall conference of the Materials Research Society of Korea (Yeosu, Korea) ,

2018.11

Poster presentation, K-MRS, MSSJ

層状化合物超伝導体Sr2VFeAsO3-δの非経験的な磁気構造

藤乘優治郎，中西愛，神原陽一

第42回日本磁気学会学術講演大会 (日本大学理工学部駿河台キャンパス1号館) ,

2018.09

Oral presentation (general)

バイオテンプレートによるYBa2Cu3O7-δマイクロワイヤの作製及び機能性検証

岩竹翼，村田陽，松本裕介，的場正憲，神原陽一

第42回日本磁気学会学術講演大会 (日本大学理工学部駿河台キャンパス1号館) ,

2018.09

Poster presentation