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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.
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.
Magnetism and Superconductivity in CeCu2Ge2 under High Pressures and Magnetic Fields
Fuminori Honda,Takashi Maeta,Yusuke Hirose,Yoshichika Onuki,Atsushi Miyake,Rikio Settai 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We measured the electrical resistivity of CeCu2Ge2 under various high pressures and strongmagnetic fields. Beyond the previous antiferromagnetic critical pressure Pc ' 8 GPa, the antiferromagneticphase is found to exist at much higher pressure of 10.9 GPa even in magnetic fields upto 8 T. The pressure vs. temperature phase diagram and the magnetic field vs. temperature phasediagram under high pressure were constructed. The pressure-induced antiferromagnetic phase isstill observed and coexists with pressure-induced superconductivity at 10.9 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.
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.