Anomalous Enhancement of Nuclear Spin Relaxation Rates of ^<109>Ag and ^<115>In at Low Temperatures in Cubic Γ_3 Ground-State System PrAg_2In : First Observation of Octupole Fluctuations of f-Electrons(Condensed matter: electronic structure and electrical
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概要
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Microscopic properties have been investigated on a cubic nonmagnetic non-Kramers Γ_3 doublet ground-state (GS) system PrAg_2In by complementarily utilizing ^<115>In (I=9/2) and ^<109>Ag (I=1/2) NMR with particular emphasis on the low-frequency (low-ω) dipole and multipole (octupole and/or quadrupole) fluctuations of f-electrons as probed by the nuclear spin relaxation rates 1/^<115>T_1 and I/^<109>T_1. We show that 1/^<115>T_1 and 1/^<109>T_1 are anomalously enhanced respectively below ⪮50K and ⪮100K over those expected for the low-ω dipole fluctuations of the excited magnetic Γ_4 and Γ_5 states in a simple crystalline-electric-field model for a Γ_3 GS system. By comparing 1/(^<115>T_1T) and 1/(^<109>T_1T) and also by considering an invariant form of the hyperfine and/or quadrupole couplings of Γ_3 octupole and/or quadrupole moments with Ag/In nuclear dipole and/or quadrupole moments, we show that Γ_3 octupole fluctuations dominate 1/^<109>T_1 and quadrupole ones can possibly contribute to 1/^<115>T_1 at low T.
- 社団法人日本物理学会の論文
- 2006-07-15
著者
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SUZUKI Hiroyuki
National Institute for Materials Science
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TAKAGI Shigeru
Physics Department, Graduate School of Science, Tohoku University
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SATOH Isamu
Institute for Materials Research, Tohoku University
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Takagi Shigeru
Physics Department Graduate School Of Science Tohoku University
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Tanida Hiroshi
Physics Department Graduate School Of Science Tohoku University:(present Office)department Of Quantu
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Tanida Hiroshi
Physics Department Graduate School Of Science Tohoku University
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KOMATSUBARA Takemi
Center for Low Temperature Science, Tohoku University
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Shigeru Takagi
Physics Department Graduate School Of Science Tohoku University
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Satoh Isamu
Institute For Material Research Tohoku University
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Satoh Isamu
Institute Of Materials Research Tohoku University
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Komatsubara Takemi
Center For Low Temperature Science Tohoku University
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Suzuki Hiroyuki
National Institute For Material Science
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TANIDA Hiroshi
Physics Department, Graduate School of Science, Tohoku University
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SATOH Isamu
Institute of Materials Research, Tohoku University
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