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RISS 인기검색어
- 검색키워드
- 저자 : Satoru Nakatsuji (검색결과 3 건)
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Low Temperature Transport Properties of the Quadrupolar Kondo Lattice System PrTi2Al20
Akito Sakai,Satoru Nakatsuji 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have investigated the low temperature transport properties of the cubic Γ3 compound PrTi2Al20. This is a quadrupolar Kondo lattice system where the nongmagnetic quadrupoles, which form a long-range order at low temperatures, have strong hybridization with the conduction electrons. A sharp drop of the resistivity due to a ferroquadrupole ordering is observed at TQ = 2.0 K. The T2 dependence of the resistivity and the large Sommerfeld coefficient γ above TQ suggest the formation of a heavy-fermion state. The temperature dependence of the resistivity below TQ does not show a power law but exponential law behavior, indicating the emergence of an anisotropy gap Δ in the collective mode associated with the ferroquadrupole order below TQ. The Fisher- Langer relation holds around TQ, suggesting the higher order scattering processes than those in Born approximation are not dominant for this ferroquadrupole ordering.
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Single-crystal Study on the Low-temperature Magnetism of the Pyrochlore Magnet Pr2Zr2O7
Kenta Kimura,Satoru Nakatsuji,A. Agung Nugroho 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
A single-crystal study on the low-temperature magnetism of a pyrochlore magnet Pr2Zr2O7 hasbeen carried out. The temperature dependence of the magnetic susceptibility shows no magneticordering at temperatures down to 1.9 K. The Curie-Weiss behavior was observed at temperaturesbelow 10 K, yielding an effective moment µeff = 2.5µB. This result, combined with those of recentreports on other Pr3+ pyrochlore magnets, suggests that the ground state of the Pr3+ crystal electricfield is a well-separated magnetic doublet. An anisotropic magnetization process is observed at lowertemperatures, and the saturated magnetization values along the three high-symmetry directions areconsistent with a local h111i Ising anisotropy with a magnetic moment gJJ = µeff = 2.5µB.
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M¨ossbauer Spectroscopy of Fe-doped Valence-fluctuating α-YbAlB4
Yui Sakaguchi,Shugo Ikeda,Hisao Kobayashi,Kentaro Kuga,Keita Sone,Satoru Nakatsuji 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The magnetic properties of high-quality 25 at.% Fe doped α-YbAlB4 with an orthorhombicPbam structure were investigated by using magnetization measurements and 57Fe M¨ossbauer spectroscopy. The temperature dependence of the magnetization along the a-axis showed anomaliesat TN2 7.7 K and TN1 10.4 K. Broadenings of the peaks in the M¨ossbauer spectrum wereobserved at temperatures below 6 K, which were due to the magnetic hyperfine fields transferredfrom the Yb magnetic moments. The evaluated transferred magnetic hyperfine field almost disappearsaround TN2. The anomalous temperature dependence of the transferred magnetic hyperfinefield reveals that the magnetic structure and the ordered magnetic moments of the Yb ions showcomplex temperature dependences at temperatures below TN1.
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