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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.
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.
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.
학아가벌자,립원순삼,구보전륭이,서산영일랑,상촌채,내등호유,본전사기,급천신효,전촌팔주부,김전겸태랑,Tsuruga, Kayoko,Kasahara, Junzo,Kubota, Ryuji,Nishiyama, Eiichiro,Kamimura, Aya,Naito, Yoshihiro,Honda, Fuminori,Oikawa, Nobutaka,Tamura, Yasuo,Ni Korean Society of Earth and Exploration Geophysici 2008 지구물리와 물리탐사 Vol.11 No.1
We present a method for interpreting seismic records with arrivals and waveforms having characteristics which could be generated by extremely inhomogeneous velocity structures, such as non-typical oceanic crust, decollement at subduction zones, and seamounts in oceanic regions, by comparing them with synthetic waveforms. Recent extensive refraction and wide-angle reflection surveys in oceanic regions have provided us with a huge number of high-resolution and high-quality seismic records containing characteristic arrivals and waveforms, besides first arrivals and major reflected phases such as PmP. Some characteristic waveforms, with significant later reflected phases or anomalous amplitude decay with offset distance, are difficult to interpret using only a conventional interpretation method such as the traveltime tomographic inversion method. We find the best process for investigating such characteristic phases is to use an interactive interpretation method to compare observed data with synthetic waveforms, and calculate raypaths and traveltimes. This approach enables us to construct a reasonable structural model that includes all of the major characteristics of the observed waveforms. We present results here with some actual observed examples that might be of great help in the interpretation of such problematic phases. Our approach to the analysis of waveform characteristics is endorsed as an innovative method for constructing high-resolution and high-quality crustal structure models, not only in oceanic regions, but also in the continental regions.
Physical Properties of a New Ternary Compound RP₃Al<SUB>5</SUB> (R = rare earth)
Hiroto Fukuda,Takatsugu Koizumi,Yoshiki J. Sato,Yusei Shimizu,Ai Nakamura,Dexin Li,Yoshiya Homma,Atsushi Miyake,Dai Aoki,Masashi Tokunaga,Ryoma Kato,Masanobu Shiga,Tatsuya Kawae,Fuminori Honda 한국물리학회 2023 새물리 Vol.73 No.12
Electronic properties of a new ternary f-electron system RP ₃Al<SUB>5</SUB> (R: rare earth elements) have been investigated. RPt ₃Al<SUB>5</SUB> crystalizes in the CePt ₃Al<SUB>5</SUB>-type orthorhombic structure where R atoms form 1-dimensional chains along the b-axis. LaPt ₃Al<SUB>5</SUB> shows superconductivity below 0.4 K, while others show magnetic ordering. CePt ₃Al<SUB>5</SUB> orders antiferromagnetically below T<SUB>N</SUB> = 1.2 K with spontaneous moment and shows successive magnetic transition at T<SUB>m</SUB> = 0.9 K. The nearly divalent antiferromagnet EuPt ₃Al<SUB>5</SUB> indicates an unusual valence cross-over behavior into the nearly trivalent state under high pressure of 9 GPa. It is also found that most of RPt ₃Al<SUB>5</SUB> orders antiferromagnetically and, in some cases, shows characteristic features in magnetic suscep- tibility, where the broad maximum appears slightly above T<SUB>N</SUB>, reecting the low-dimensional nature.