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Effect of Pressure on the Field-induced Ordered Phase in the Heavy-fermion Compound YbCo2Zn20
Tetsuya Takeuchi,Yuki Taga,Shingo Yoshiuchi,Masahiro Ohya,Yusuke Hirose,Fuminori Honda,Rikio Settai,Yoshichika Onuki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The effect of pressure on the field-induced ordered phase for H k h111i in the heavy-fermioncompound YbCo2Zn20, which is presumably a field-induced antiferro-quadrupolar (FI-AFQ) phase,was investigated in the pressure range up to 4.5 GPa and under magnetic fields up to 80 kOe. When pressure is applied, the metamagnetic-like transition at Hm =6 kOe shifts to lower fieldsand disappears around the quantum critical pressure Pc 1.8 GPa. A pressure-induced antiferromagnetic(PI-AFM) phase appears at pressures above about 2 GPa, and the critical field Hc ofthe PI-AFM phase increases with increasing pressure. On the other hand, the transition field HQof the FI-AFQ phase decreases gradually without showing any anomalous behavior around Pc andbecomes obscure around 4 GPa, where Hc of the PI-AFM phase and HQ of the FI-AFQ phasebecome comparable. The magnetic field versus pressure, H-P, phase diagram for H k h111i at0.1 K was constructed in the pressure range up to 4.5 GPa.
Specific-Heat Study on the Noncentrosymmetric Heavy-Fermion Superconductor CePt3Si
Tetsuya Takeuchi,Masahiko Tsujino,Takashi Yasuda,Shin Hashimoto,Rikio Settai,Yoshichika Onuki 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
Specific-heat measurements were performed on a high-quality single crystal of CePt3Si without inversion symmetry in the tetragonal crystal structure. We observed distinct peaks in the specific-heat C at the superconducting transition temperature Tc =0.46 K and the antiferromagnetic ordering temperature TN =2.25 K, compared to the previous data, indicating an improvement of the sample quality. The temperature dependence of the electronic specific-heat coefficient Ce=T below about 0.3 K is well described y the equation of Ce/T = γs + βsT with γs =34.1 mJ/K2·mol and βs =1290 mJ/K3·mol, evidencing the existence of line nodes in the superconducting energy gap. Furthermore, the electronic specific-heat coefficient γs in the superconducting state indicates a nonlinear magnetic eld dependence s(H) / pH, which also supports the presence of line nodes. Specific-heat measurements were performed on a high-quality single crystal of CePt3Si without inversion symmetry in the tetragonal crystal structure. We observed distinct peaks in the specific-heat C at the superconducting transition temperature Tc =0.46 K and the antiferromagnetic ordering temperature TN =2.25 K, compared to the previous data, indicating an improvement of the sample quality. The temperature dependence of the electronic specific-heat coefficient Ce=T below about 0.3 K is well described y the equation of Ce/T = γs + βsT with γs =34.1 mJ/K2·mol and βs =1290 mJ/K3·mol, evidencing the existence of line nodes in the superconducting energy gap. Furthermore, the electronic specific-heat coefficient γs in the superconducting state indicates a nonlinear magnetic eld dependence s(H) / pH, which also supports the presence of line nodes.
Takeuchi, Fumi,Kawai, Masamichi,Zhang, Jian-Qi,Matsuda, Tetsuya The Korean Society for Composite Materials 2008 Advanced composite materials Vol.17 No.1
The present paper focuses on experimental verification of the ply-by-ply basis inelastic analysis of multidirectional laminates. First of all, rate dependence of the tensile behavior of balanced symmetric cross-ply T800H/epoxy laminates with a $[0/90]_{3S}$ lay-up under off-axis loading conditions at $100^{\circ}C$ is examined. Uniaxial tension tests are performed on plain coupon specimens with various fiber orientations $[{\theta}/(90-{\theta})]_{3S}$ ($\theta$ = 0, 5, 15, 45 and $90^{\circ}C$) at two different strain rates (1.0 and 0.01%/min). The off-axis stress.strain curves exhibit marked nonlinearity for all the off-axis fiber orientations except for the on-axis fiber orientations $\theta$ = 0 and $90^{\circ}$, regardless of the strain rates. Strain rate has significant influences not only on the off-axis flow stress in the regime of nonlinear response but also on the apparent off-axis elastic modulus in the regime of initial linear response. A macromechanical constitutive model based on a ply viscoplasticity model and the classical laminated plate theory is applied to predictions of the rate-dependent off-axis nonlinear behavior of the cross-ply CFRP laminate. The material constants involved by the ply viscoplasticity model are identified on the basis of the experimental results on the unidirectional laminate of the same carbon/epoxy system. It is demonstrated that good agreements between the predicted and observed results are obtained by taking account of the fiber rotation induced by deformation as well as the rate dependence of the initial Young's moduli.
Yoshichika Onuki,Rikio Settai,Kiyohiro Sugiyama,Tetsuya Takeuchi,Fuminori Honda,Yoshinori Haga,Etsuji Yamamoto,Tatsuma D. Matsuda,Naoyuki Tateiwa,Dai Aoki,Ilya Sheikin,Hisatomo Harima 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The f-electron system in rare-earth and actinide compounds exhibit a variety of characteristicproperties including heavy fermions and unconventional superconductivity. The Fermi surface propertiesin rare-earth and actinide compounds are clarified by the de Haas-van Alphen experimentson the basis of the results of energy band calculations. The effect of pressure on the electronicstates of CeRhIn5, CeIrSi3, and YbIr2Zn20 is studied in magnetic fields. An electronic instability,including unconventional superconductivity, occurs at 2.4 GPa in CeRhIn5 and 2.6 GPa in CeIrSi3. An abrupt non-linear increase in the magnetization, namely, a metamagnetic behavior, is found inthe heavy fermion compounds, including YbT2Zn20 (T: Co, Rh, Ir). A super-heavy fermion statewith a specific heat coefficient of 10 J/(K2·mol) is realized in YbIr2Zn20 under pressure.
( Bhattacharjee Rabindra N. ),( Kwon Sam Park ),( Xiu Hao Chen ),( Tetsuya Iida ),( Takeshi Honda ),( Osamu Takeuchi ),( Shizuo Akira ) 한국미생물 · 생명공학회 2008 Journal of microbiology and biotechnology Vol.18 No.1
Here, we report that Vibrio parahaemolyticus induces a rapid remodeling of macrophage actin and activates RhoB GTPase. Mutational analysis revealed that the effects depend on type III secretion system 1 regulated translocation of a V. parahaemolyticus effector protein, VP1686, into the macrophages. Remodeling of actin is shown to be necessary for increased bacterial uptake followed by initiation of apoptosis in macrophages. This provides evidence for functional association of the VP1686 in triggering an eatme-and-die signal to the host.
Single Crystal Growth and Various Electronic States in Yb-based Compounds
Yusuke Hirose,Shingo Yoshiuchi,Naoto Nishimura,Junya Sakaguchi,Kentaro Enoki,Ken Iwakawa,Yasunao Miura,Kiyohiro Sugiyama,Yoshichika Onuki,Rikio Settai,Tetsuya Takeuchi,Fuminori Honda,Tatsuma D. Matsud 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We succeeded in growing single crystals of YbTIn5 (T : Co, Rh, Ir), YbGa4, YbT2Zn20 (T : Co,Rh, Ir), YbPdGe, Yb2Pt2Pb, and YbPd5Al2. The electronic and magnetic properties are clarifiedby measuring the electrical resistivity, magnetic susceptibility, magnetization, specific heat and deHaas - van Alphen effect.
Anomalous Hall Effect in Rare Earth Antiferromagnets with the Hexagonal Structures
Yoshichika ?nuki,Kenri Nakaima,Wataru Iha,Shinya Matsuda,Masato Hedo,Takao Nakama,Dai Aoki,Ai Nakamura,Miho Nakashima,Yasushi Amako,Tetsuya Takeuchi,Tatsuma D. Matsuda 한국물리학회 2023 새물리 Vol.73 No.12
We measured Hall resistivities in nine antiferromagnets with the AlB<SUB>2-</SUB> and ZrNiAl-types hexagonal structures and found characteristic magnetic phases especially in ErGa₂ and HoAgGe.