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Yuji Matsuda 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Half-integer thermal quantum Hall conductance recently reported in the two-dimensional honeycomb material α-RuCl3 indicates the presence of non-ablian anyons, which are relevant for fault-tolerant topological quantum computations, in a quantum magnet. Here, based on recent studies of thermal transport and thermodynamic measurements in the magnetic field of α-RuCl3, we discuss the topological Chern number of Majorana band, Majorana gap, and field induced topological phase transition of the Kitaev spin liquid.
Single Crystal Growth and Physical Properties of UT2Al20 (T=Transition Metal)
Yuji Matsumoto,Tatsuma D. Matsuda,Naoyuki Tateiwa,Etsuji Yamamoto,Yoshinori Haga,Zachary Fisk 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have studied the single crystal growth and the physical properties of the UT2Al20 system. Wehave successfully grown UT2Al20 (T = Cr, Ti, W and Mo) using Al self flux and have characterizedthe crystals using electron probe microanalyzer (EPAM) and X-ray diffractometer. We have alsomeasured their magnetic and electric properties. The ground states of UT2Al20 (T = Cr, Mo andW ) are Pauli paramagnetic as is likely also in UTi2Al20. The effective masses of UCr2Al20 andUTi2Al20 are only weakly enhanced.
Direct Effect of a Hot Environment on Ruminal Motility in Sheep
Sunagawa, Katsunori,Arikawa, Yuji,Higashi, Mika,Matsuda, Hiroshi,Takahashi, Hiroshi,Kuriwaki, Zyunichi,Kojiya, Zuikou,Uechi, Syuntoku,Hongo, Fujiya Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.6
The aim of this research was to clarify the direct effects of a hot environment on ruminal motility in sheep fed twice a day. In the first experiment, in order to equalize variable factors excluding the ambient temperature between the thermoneutral environment ($23^{\circ}C$, relative humidity 80%) and the hot environment ($32^{\circ}C$, relative humidity 80%), sheep were fed equal amounts of the same quality feed twice a day. The sheep were allowed free access to water for the duration of the two one-hour feeding periods (10:00 am-11:00 am, 5:00 pm-6:00 pm). On the fourth day after exposure to the hot environment, the frequency and strength of ruminal contractions were continuously recorded between 9:30 am and 11:00 pm. Prior to the exposure to a hot environment the frequency and strength of ruminal contractions were recorded in a thermoneutral environment during the period 9:30 am-11:00 pm. In the second experiment, in order to maintain the stomach content of the sheep at equal levels in both environments, the sheep were fed equal amounts of the same quality feed twice a day. Following the completion of the two one-hour feeding periods, a fixed amount of warm water was infused into the rumen. Rumen motility was then recorded during the same period as for the first experiment (9:30 am-11:00 pm). In the first experiment, when the frequency of ruminal contractions prior to (24, 24 frequency/15 min), during (48, 47 frequency/min) and after (22, 19 frequency/min) both the morning and afternoon feeding in a hot environment was compared with the values from the thermoneutral environment (20, 22; 50, 50; 21, 20 frequency/min), there was found to be no difference. However, the strength of ruminal contractions after morning and afternoon feeding (3.7, 3.1 mm Hg) in the hot environment decreased significantly in comparison with the thermoneutral environment (4.3, 3.8 mm Hg). In the second experiment, the frequency of ruminal contractions in the hot environment was not significantly different from that in the thermoneutral environment. The strength of ruminal contractions after ruminal infusion of warm water in the hot environment (morning: 4.6, afternoon: 4.5 mm Hg) was significantly lower than that in the thermoneutral environment (morning: 5.6, afternoon: 5.0 mm Hg). The results suggest that a hot environment acts directly on the strength of ruminal contractions in sheep fed twice a day rather than on the frequency.
29Si-NMR Study of Antiferromagnet CeRh2Si2 Using Single Crystals
Hironori Sakai,Yo Tokunaga,Shinsaku Kambe,Yuji Matsumoto,Tatsuma D. Matsuda,Yoshinori Haga 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
29Si-NMR Study of antiferromagnet CeRh2Si2 with a tetragonal ThCr2Si2-type structure hasbeen performed using single crystals. The Knight shifts along the a and the c axes have beenmeasured as a function of temperatures in the paramagnetic state. At ambient pressure, the Knightshifts show the Ising-type anisotropy along the c axis, which is similar to the magnetic susceptibility. The hyperfine coupling constants for 29Si along the a and the c axes have been determined fromKnight shift versus static susceptibility plots.