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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.
Naoto Metoki,Hironori Sakai,Yasunori Haga,Tatsuma D. Matsuda,Shugo Ikeda 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The magnetic excitation of a narrow gap semiconductor β-US2 was studied by means of neutronscattering. At low temperatures, clear crystalline electric-field (CEF) excitations were observed,indicating the localized character of 5f electrons. The pseudo-doublet state at an excitation energyof 7 meV is consistent with the level scheme based on the 5f2 configuration of U4+ ions, whichreproduces the magnetic susceptibility, magnetization, and specific heat. At elevated temperatures,the conductivity recovers, with the excitation of 5f carriers being beyond the conduction gap of 90K. Simultaneously, the CEF excitation becomes weak and broad, and is replaced by a quasi-elasticresponse of magnetic origin, indicating a crossover of the 5f character from localized to itinerant.