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RISS 인기검색어
- 검색키워드
- 저자 : Yusuke Amakai (검색결과 3 건)
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Magnetic Properties of C15 the Laves-phase Compound SmRu2
Yusuke Amakai,Mototsugu Sato,Shigeyuki Murayama,Naoki Momono,Hideaki Takano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We report the magnetic properties of the polycrystalline C15 Laves-phase rare-earth compoundSmRu2. The sample of SmRu2 was made by using an arc-melt method and was annealed under500 C in vacuumed quartz tube for 50 hours. The magnetic susceptibility χ of SmRu2 followsa Curie-Weiss law at temperature above 80 K. The effective paramagnetic moment peff is 1.39µB/Sm-atom, and the Weiss temperature has a positive value of 42 K. The low-temperature χ forT < 60 K increases rapidly with decreasing temperature. In the resistivity and the specific heatCp, we found an inflection and a jump, respectively, at about 55 K. Furthermore, we observed ahysteresis in the magnetic field dependence of the magnetization at 2 K. These experimental resultssuggest that the C15 Laves-phase compound SmRu2 is a ferromagnetic material with TC 55 K.
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Structures and Magnetic Properties of Tm1−yYyMn1−xCoxO3
Toshiyuki Tanaka,Akira Kumagai,Yusuke Amakai,Naoki Momono,Shigeyuki Murayama,Hideaki Takano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The structure and magnetic properties of Tm1−yYyMn1−xCoxO3 with 0 5 x 5 0.5 and0 5 y 5 0.3 were investigated by X-ray diffraction, specific heat and magnetization measurements. Thulium manganite TmMnO3 prepared by solid-state synthesis at ambient pressure ishexagonal and antiferromagnetic with a N`eel temperature TN of 86 K. The substitution of Y for Tmin TmMnO3 does not greatly affect the fundamental hexagonal structure. The magnetization andspecific heat measurement results for Tm1−yYyMnO3 can be qualitatively explained in terms of thedilution effect of Tm by Y. On the other hand, the structure of TmMn1−xCoxO3 changes graduallyfrom hexagonal to orthorhombic with the substitution of Co for Mn; hexagonal and orthorhombicphases coexist in samples for x 5 0.3 whereas TmMn0.6Co0.4O3 is almost a single orthorhombicphase. The magnetization of TmMn0.6Co0.4O3 in a field of 250 Oe increases rapidly at about60K with decreasing temperature. The difference between zero-field-cooled (ZFC) and field-cooled(FC) magnetizations increases remarkably at about 60 K. Moreover, the temperature dependencesof the ZFC and the FC magnetizations exhibit peaks at about 40 and 30 K, respectively. Thus,TmMn1−xCoxO3 exhibits complex magnetic properties.
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Electronic States for Dense Kondo Amorphous Alloy Ce-Al
Wuriga,Kotaro Segawa,Yusuke Amakai 한국물리학회 2023 새물리 Vol.73 No.12
We have performed the magnetic susceptibility χ, specific heat C<SUB>p</SUB>, and photoelectron spec-troscopy (XPS) measurements on the dense Kondo amorphous alloys Ce<SUB>50-x</SUB>La<SUB>x</SUB>Al<SUB>50</SUB> and discussed its electronic structure. The χ follows a Curie-Weiss law with the paramagnetic e_ective magnetic 2.1{2.3 _B/Ce-atom above 70 K. The electronic specific heat coe_cient per Ce-atom Ce is almost constant in each La concentration (<SUB>rCe</SUB> = 200 mJ mol<SUP>-1</SUP> K<SUP>-2</SUP>). From XPS measurements, the Ce-contained sample (x ≤ 25) is in a hybridization state with conduction electrons (Kondo effect) at room temperature, although the Ce is trivalent, and the Kondo temperature is distributed over a wide temperature range.
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